Any luck finding out what happened to the file that broke?
I'm afraid not. I did open the file you sent me and it is indeed not working properly, but I can't find what corrupted it in the first place. My best bet is that either some rare bug occurred and the file wasn't saved properly, or the file was corrupted some other way, perhaps unrelated to Pixelorama. That would explain why we can't reproduce it. Either way, I'm still going to have my eyes opened in case it is Pixelorama's fault.