After closing a session with the QSys 2.0 plug-in instantiated, then opening another session, Pro Tools displays error "Could not open this file because the required resources were not found."
QSys 2.0 was prone to this. Registered users can get an update from QSound Labs by emailing them at
digisupport@qsound.comA workaround in version 2.0 is to close and relaunch Pro Tools to get back to normal functionality.