The template had a block setting of block full height. The first block, containing rows for a logo, menu, and gallery was also overriding to vertical row position center.
Caused the gallery in row 3 to fill the screen height and the two rows above (logo & menu) weren't seen, probably above the viewport.
Switching the template to block height auto seemed to fix it. (guessing the user didn't actually want block height full for all)
This Github issue is synchronized with Zendesk:
Ticket ID: #189372 Priority: normal Group: Developers Requester: steve@pro.photo Organization: Downshift Issue escalated by: Josh Arens
Original ticket description: