diff --git a/backend/__tests__/services/usageSnapshotSignals.test.js b/backend/__tests__/services/usageSnapshotSignals.test.js
new file mode 100644
index 00000000..b31efcf4
--- /dev/null
+++ b/backend/__tests__/services/usageSnapshotSignals.test.js
@@ -0,0 +1,152 @@
+/**
+ * Report accuracy (#1110).
+ *
+ * Two signals were wrong in ways that only show up in the aggregate, where
+ * nobody can tell the number is wrong: preset-themed installs all reported
+ * `grid`, and CSS applied through a template reported no custom CSS at all.
+ *
+ * Also covers status() surviving a misconfigured collector URL — it used to
+ * throw, which took down the settings tab that is the only way to withdraw.
+ */
+const knex = require('knex');
+const { UsageService } = require('../../src/usage/UsageService');
+
+async function bootDb() {
+  const db = knex({
+    client: 'sqlite3',
+    connection: { filename: ':memory:' },
+    useNullAsDefault: true,
+  });
+  await db.schema.createTable('product_usage_state', (t) => {
+    t.integer('id').primary();
+    t.string('status', 30).notNullable().defaultTo('disabled');
+    t.boolean('notice_dismissed').notNullable().defaultTo(false);
+    t.string('installation_id', 64);
+    t.string('public_key', 59);
+    t.text('private_key_encrypted');
+    t.string('instance_binding', 64);
+    t.bigInteger('sequence').notNullable().defaultTo(0);
+    t.text('pending_packet'); t.text('last_packet'); t.text('last_receipt');
+    t.string('last_report_date', 10); t.string('last_error', 80);
+    t.text('feedback_preferences'); t.string('lease_token', 36);
+    t.bigInteger('lease_until').notNullable().defaultTo(0);
+    t.bigInteger('cancel_seq').notNullable().defaultTo(0);
+  });
+  await db('product_usage_state').insert({ id: 1 });
+  await db.schema.createTable('product_usage_markers', (t) => t.string('feature', 60).primary());
+  await db.schema.createTable('app_settings', (t) => {
+    t.string('setting_key').primary(); t.text('setting_value'); t.string('setting_type');
+  });
+  await db.schema.createTable('feature_flags', (t) => {
+    t.string('key').primary(); t.boolean('value');
+  });
+  await db.schema.createTable('events', (t) => {
+    t.increments('id'); t.text('color_theme'); t.string('external_path');
+    t.integer('css_template_id');
+  });
+  await db.schema.createTable('css_templates', (t) => {
+    t.increments('id'); t.boolean('is_enabled'); t.text('css_content');
+  });
+  for (const table of ['email_configs', 'mail_accounts']) {
+    await db.schema.createTable(table, (t) => { t.increments('id'); t.string('smtp_host'); });
+  }
+  await db.schema.createTable('whatsapp_configs', (t) => {
+    t.increments('id'); t.boolean('enabled'); t.string('phone_number_id'); t.string('access_token');
+  });
+  return db;
+}
+
+const service = (db, over = {}) =>
+  new UsageService(db, { secret: 'q'.repeat(48), ...over });
+
+describe('gallery_layouts resolves what the gallery actually renders', () => {
+  let db;
+  afterEach(async () => { if (db) await db.destroy(); db = null; });
+
+  it('maps preset NAMES to their layouts instead of calling them all grid', async () => {
+    db = await bootDb();
+    await db('events').insert([
+      { color_theme: 'modernMasonry' },
+      { color_theme: 'corporateTimeline' },
+      { color_theme: 'galleryStory' },
+    ]);
+    const report = await service(db).snapshot();
+    expect(report.gallery_layouts.sort()).toEqual(
+      ['gallery-story', 'masonry', 'timeline'].sort()
+    );
+  });
+
+  it('still reads a theme object', async () => {
+    db = await bootDb();
+    await db('events').insert([{ color_theme: JSON.stringify({ galleryLayout: 'mosaic' }) }]);
+    expect((await service(db).snapshot()).gallery_layouts).toEqual(['mosaic']);
+  });
+
+  it('reports an unknown preset as other, not as grid', async () => {
+    // A preset added on the frontend must not silently inflate the grid count.
+    db = await bootDb();
+    await db('events').insert([{ color_theme: 'somePresetAddedLater' }]);
+    expect((await service(db).snapshot()).gallery_layouts).toEqual(['other']);
+  });
+
+  it('uses the global theme for an event that has none of its own', async () => {
+    db = await bootDb();
+    await db('app_settings').insert({
+      setting_key: 'theme_config',
+      setting_value: JSON.stringify({ galleryLayout: 'carousel' }),
+    });
+    await db('events').insert([{ color_theme: null }]);
+    expect((await service(db).snapshot()).gallery_layouts).toEqual(['carousel']);
+  });
+});
+
+describe('custom_css counts CSS applied through a template', () => {
+  let db;
+  afterEach(async () => { if (db) await db.destroy(); db = null; });
+
+  it('is configured when an enabled template is applied to an event', async () => {
+    db = await bootDb();
+    const [id] = await db('css_templates').insert({ is_enabled: true, css_content: '.a{}' });
+    await db('events').insert([{ color_theme: null, css_template_id: id }]);
+    expect((await service(db).snapshot()).features.custom_css.configured).toBe(true);
+  });
+
+  it('is not configured when the applied template is disabled', async () => {
+    db = await bootDb();
+    const [id] = await db('css_templates').insert({ is_enabled: false, css_content: '.a{}' });
+    await db('events').insert([{ color_theme: null, css_template_id: id }]);
+    expect((await service(db).snapshot()).features.custom_css.configured).toBe(false);
+  });
+
+  it('is not configured when an enabled template is applied to nothing', async () => {
+    db = await bootDb();
+    await db('css_templates').insert({ is_enabled: true, css_content: '.a{}' });
+    await db('events').insert([{ color_theme: null }]);
+    expect((await service(db).snapshot()).features.custom_css.configured).toBe(false);
+  });
+});
+
+describe('status survives a misconfigured collector URL', () => {
+  let db;
+  afterEach(async () => { if (db) await db.destroy(); db = null; });
+
+  it.each([
+    ['a bare hostname', 'usage.picpeak.app'],
+    ['a URL with a path', 'https://usage.picpeak.app/collect'],
+    ['a URL with a query', 'https://usage.picpeak.app/?x=1'],
+  ])('reports %s as a configuration error rather than failing the request', async (_l, endpoint) => {
+    db = await bootDb();
+    const status = await service(db, { endpoint }).status();
+    expect(status.collector_error).toBe('INVALID_COLLECTOR_URL');
+    expect(status.collector_url).toBeNull();
+    // The operator can still read their state — and therefore still withdraw.
+    expect(status.status).toBe('disabled');
+  });
+
+  it('reports no error for a valid collector', async () => {
+    db = await bootDb();
+    const status = await service(db, { endpoint: 'https://usage.picpeak.app' }).status();
+    expect(status.collector_error).toBeNull();
+    expect(status.collector_url).toBe('https://usage.picpeak.app');
+  });
+});
diff --git a/backend/src/usage/UsageService.js b/backend/src/usage/UsageService.js
index 95491f18..6c7b693a 100644
--- a/backend/src/usage/UsageService.js
+++ b/backend/src/usage/UsageService.js
@@ -56,6 +56,41 @@ const SETTING_KEYS = [
   'general_public_site_custom_css'
 ];
 const truth = (value) => value === true || value === 1 || value === '1';
+
+// `events.color_theme` holds either a theme object or the NAME of a preset —
+// the admin theme picker stores names, and eventTypeService seeds them too
+// (`theme_preset: 'corporateTimeline'`). Reading only `value.galleryLayout`
+// therefore reported `grid` for every preset-themed install.
+//
+// Only the layout each name maps to is duplicated here, not the presets
+// themselves; frontend/src/types/theme.types.ts stays the source of truth. A
+// name this map does not know reports `other` rather than a confident `grid`,
+// so a preset added on the frontend degrades to "something else" instead of
+// quietly inflating the grid count.
+const PRESET_LAYOUTS = {
+  default: 'grid',
+  elegantWedding: 'grid',
+  modernMasonry: 'masonry',
+  birthdayFun: 'carousel',
+  corporateTimeline: 'timeline',
+  artisticMosaic: 'mosaic',
+  darkClassic: 'grid',
+  darkElegant: 'grid',
+  darkModern: 'masonry',
+  galleryPremium: 'gallery-premium',
+  galleryStory: 'gallery-story'
+};
+
+function resolveLayout(value) {
+  const named =
+    typeof value === 'string'
+      ? PRESET_LAYOUTS[value]
+      : value && typeof value === 'object'
+        ? value.galleryLayout
+        : null;
+  if (!named) return typeof value === 'string' ? 'other' : 'grid';
+  return LAYOUTS.includes(named) ? named : 'other';
+}
 const parse = (value) => {
   try {
     return JSON.parse(value);
@@ -170,11 +205,26 @@ class UsageService {
   }
   async status() {
     const state = await this.state();
+    // Reported, not thrown. status() used to call collectorUrl() bare, so a
+    // misconfigured USAGE_COLLECTOR_URL — a bare hostname, a path, a query, or
+    // http in production — failed this request outright. The settings page
+    // renders one generic failure when its status query errors, so the
+    // operator saw "the operation could not be completed" with no cause AND
+    // no way to reach their own state: they could not read the status or even
+    // withdraw, because every control on that tab is behind this call.
+    let collectorUrl = null;
+    let collectorError = null;
+    try {
+      collectorUrl = this.collectorUrl();
+    } catch {
+      collectorError = 'INVALID_COLLECTOR_URL';
+    }
     return {
       status: state.status,
       notice_dismissed: Boolean(state.notice_dismissed),
       installation_id: state.installation_id,
-      collector_url: this.collectorUrl(),
+      collector_url: collectorUrl,
+      collector_error: collectorError,
       schema_version: 'usage.v1',
       last_report_date: state.last_report_date,
       last_error: state.last_error,
@@ -613,21 +663,35 @@ class UsageService {
           .first()
       );
     const theme = settings.theme_config || {};
+    // An enabled template applied to an event is gallery styling by the same
+    // definition as the settings fields — the Custom CSS tab is where both are
+    // authored. Existence only; template contents are never read.
+    const appliedTemplate = await this.db('css_templates')
+      .where('is_enabled', formatBoolean(true))
+      .whereIn(
+        'id',
+        this.db('events').whereNotNull('css_template_id').select('css_template_id')
+      )
+      .select('id')
+      .first();
     features.custom_css.configured = Boolean(
       settings.general_custom_css ||
         settings.general_public_site_custom_css ||
-        theme.customCss
+        theme.customCss ||
+        appliedTemplate
     );
     // Read only the theme field, never event names, IDs, sizes, counts, or photos.
     const themes = await this.db('events').distinct('color_theme');
     const layouts = new Set();
+    // An event with no theme of its own renders with the global one.
+    const inheritedLayout = resolveLayout(theme);
     for (const row of themes) {
       const value = parse(row.color_theme);
-      const layout =
-        value && typeof value === 'object'
-          ? value.galleryLayout || 'grid'
-          : 'grid';
-      layouts.add(LAYOUTS.includes(layout) ? layout : 'other');
+      if (row.color_theme === null || row.color_theme === '') {
+        layouts.add(inheritedLayout);
+      } else {
+        layouts.add(resolveLayout(value));
+      }
       if (value && typeof value === 'object' && value.customCss)
         features.custom_css.configured = true;
     }
diff --git a/frontend/src/features/settings/tabs/ProductUsageTab.tsx b/frontend/src/features/settings/tabs/ProductUsageTab.tsx
index c512d86f..1aade5ab 100644
--- a/frontend/src/features/settings/tabs/ProductUsageTab.tsx
+++ b/frontend/src/features/settings/tabs/ProductUsageTab.tsx
@@ -155,6 +155,14 @@ export default function ProductUsageTab() {
         {data.last_report_date && (
           <p>{t('productUsage.lastReport', { date: data.last_report_date })}</p>
         )}
+        {data.collector_error === 'INVALID_COLLECTOR_URL' && (
+          <p role="alert" className="text-amber-700 dark:text-amber-300">
+            {/* Shown alongside the real controls, not instead of them: with a
+                bad URL the operator still needs to read their status and
+                still needs to be able to withdraw. */}
+            {t('productUsage.invalidCollectorUrl')}
+          </p>
+        )}
         {data.last_error && (
           <p role="status">
             {/* Retrying cannot fix an unreadable signing key, and neither can
@@ -210,14 +218,16 @@ export default function ProductUsageTab() {
               </Button>
             </>
           )}
-          <a
-            className="text-sm text-primary-600 dark:text-primary-400 hover:underline self-center"
-            href={`${data.collector_url}/transparency`}
-            target="_blank"
-            rel="noreferrer"
-          >
-            {t('productUsage.transparency')}
-          </a>
+          {data.collector_url && (
+            <a
+              className="text-sm text-primary-600 dark:text-primary-400 hover:underline self-center"
+              href={`${data.collector_url}/transparency`}
+              target="_blank"
+              rel="noreferrer"
+            >
+              {t('productUsage.transparency')}
+            </a>
+          )}
         </div>
       </Card>
       {active && (
@@ -449,7 +459,7 @@ export default function ProductUsageTab() {
       {message && <p role="status">{message}</p>}
       {consent && (
         <ConsentDialog
-          collector={data.collector_url}
+          collector={data.collector_url ?? ''}
           busy={busy}
           close={() => setConsent(false)}
           enable={() =>
diff --git a/frontend/src/i18n/locales/de.json b/frontend/src/i18n/locales/de.json
index 5e282121..2ffcb6f7 100644
--- a/frontend/src/i18n/locales/de.json
+++ b/frontend/src/i18n/locales/de.json
@@ -26,6 +26,7 @@
     "hash": "Dein vertraulicher Abfrage-Hash",
     "lastReport": "Zuletzt angenommener Bericht: {{date}} (UTC)",
     "deliveryProblem": "Die Übertragung benötigt Aufmerksamkeit. Bei Löschung oder Identitätskonflikt ist die Erfassung gestoppt. Versuche es erneut oder deaktiviere die Teilnahme, um die Daten zu löschen.",
+    "invalidCollectorUrl": "Die konfigurierte Collector-URL ist ungültig, daher kann die Teilnahme weder gestartet noch übermittelt werden. Setzen Sie USAGE_COLLECTOR_URL auf einen https-Origin ohne Pfad, Query oder Zugangsdaten (oder lassen Sie sie leer, um den Standard zu verwenden).",
     "signingKeyUnreadable": "Der Signaturschlüssel für die Nutzungsdaten kann nicht gelesen werden. Meist wurde USAGE_ENCRYPTION_KEY — oder das als Rückfallwert genutzte JWT_SECRET — geändert. Berichte können nicht gesendet und auch die Löschanfrage kann nicht signiert werden. Stellen Sie das ursprüngliche Schlüsselmaterial wieder her, um die Löschung abzuschließen; erneutes Senden oder Deaktivieren allein behebt dies nicht.",
     "inspect": "Genau sehen, was geteilt wird",
     "preview": "Nächsten Bericht ansehen",
diff --git a/frontend/src/i18n/locales/en.json b/frontend/src/i18n/locales/en.json
index 46ee590f..2853dd0b 100644
--- a/frontend/src/i18n/locales/en.json
+++ b/frontend/src/i18n/locales/en.json
@@ -26,6 +26,7 @@
     "hash": "Your private lookup hash",
     "lastReport": "Last accepted report: {{date}} (UTC)",
     "deliveryProblem": "Delivery needs attention. Collection stops during deletion or an identity conflict. Use retry, or disable participation to delete its data.",
+    "invalidCollectorUrl": "The configured usage collector URL is not valid, so participation cannot be started or delivered. Set USAGE_COLLECTOR_URL to an https origin with no path, query or credentials (or leave it unset to use the default).",
     "signingKeyUnreadable": "The usage signing key cannot be read, which usually means USAGE_ENCRYPTION_KEY — or JWT_SECRET, which it falls back to — was changed. Reports cannot be sent and the deletion request cannot be signed either. Restore the original encryption material to finish deletion; retrying or disabling will not resolve it on its own.",
     "inspect": "See exactly what is shared",
     "preview": "Preview next report",
diff --git a/frontend/src/services/productUsage.service.ts b/frontend/src/services/productUsage.service.ts
index 8bbc4739..8bcadc55 100644
--- a/frontend/src/services/productUsage.service.ts
+++ b/frontend/src/services/productUsage.service.ts
@@ -9,7 +9,8 @@ export interface UsageStatus {
     | 'identity_conflict';
   notice_dismissed: boolean;
   installation_id: string | null;
-  collector_url: string;
+  collector_url: string | null;
+  collector_error?: 'INVALID_COLLECTOR_URL' | null;
   schema_version: string;
   last_report_date: string | null;
   last_error: string | null;