Alright I think I got thumbnails ironed out. Basically the automated restarts to the thumbnail system weren't actually happening because of a bug in the reset script that made it incompatible with the scheduling software (it used relative file locations and the scheduling software needed absolute file locations). I fixed that, so now I think it will actually reset every day like it should.

If you see broken thumbnails again, let me know and I'll increase the frequency of the automated restarts to the thumbnail system. Right now it's once a day at around 4am.