It appears that the database is having trouble generating thumbnails for new images. Viewing the gallery of new files just shows a wall of white, which should not happen. This was reproduced across 3 browsers, 2 devices, and 2 accounts.

Hmm, looks fine from here! Is it working now?

Seems to be working now, but last I remember, only the top row and one from the row under was white.

As a late chime in, it looks like this has resolved on its own - but feel free to give this thread a nudge if it starts to happen again.