It was a software error. I clicked on "clean unused images", and for some reason the board thought all JPGs were unused and deleted them.

Don't worry, I took steps to make sure it won't happen again

is that something Kusaba X might be doing by default or did you modify something?

asking because relevant to my interests.

>>520
I'll tell you only this: If you're going to set up a board, use something other than Kusaba X. It's a real headache under the hood.

>>526
.... crapapples.