showLogout was hard-coded true, so a gallery with no password showed a Logout button. Logging out of it is meaningless — no credential to drop, nothing to return to — and it stranded the visitor: GalleryPage's auto-login is a one-shot latch, so clearing the session left the page on its skeleton until a manual reload. That is the 'turns blank' in the report.
The button is gated on requiresPassword || isClient || viaCustomer at both call sites. The full-page layouts render it on the callback being present rather than on a flag, so withholding the callback is how the gate reaches them.
Session kind now comes from /auth/session rather than sessionStorage, which is per-tab while the cookie is per-browser: a gallery reopened in a second tab lost 'client' while the backend kept serving it as one. viaCustomer marks a portal token, which bypasses reveal mode and so is a credential that does not look like one.
The public-gallery branch no longer returns the skeleton unconditionally — once auto-login has run and left us unauthenticated it shows the reason and a Retry. That state was otherwise unrecoverable, and it also swallowed loginError entirely.
Merged with admin privileges: the author cannot self-approve.
Paul Nothaft
e4a8be8e7e