I've just installed SUblimePaster on two Sublime 2 installations, one the mainline release b2165, and the other the dev release at b2168. In both instances, I'm unable to switch from whatever mode I was currently in when enabling/installing SublimePaster.
Disabling SublimePaster allows me to freely switch editing modes again. I'm not certain if this is a keybinding issue or something else, don't yet know the sublime API well enough to try and run exit_insert_mode from the Python console.
Running OS 10.6.8 on both machines.