Hum... strange bug: I can't seem to open any roms in the actual PocketSNES folder. I can open roms in any subfolders inside the folder, but none in the main PocketSNES folder itself. If I do the emulator freezes while loading the rom. All roms worked with the last version's app and sim files.
EDIT: I found that when I moved everything into one folder, all the roms that were in a separate folder still worked while the others didn't. I'm going to check if it's the roms themselves.
EDIT2: Tested that. Roms work fine elsewhere, replacing them with another copy didn't do anything. Everything still works perfect with 2.1