This is probably a Rust proper bug, but I thought I'd put it in here, just in case, and despite knowing everyone knows the bug is a thing, I didn't see it in here, sooooo...
Pictures will stop showing inside the photo frames despite still being in them. Sometimes turning off and on your signs will fix it, other times not. removing the picture and putting it back in fixes the problem, but it will happen again.
Server: Scourge