re m329
it is usually very stable...
what MIDI devices are you using?
check you MIDI settings in Utilities

Also check permissions of the folder you are using for the application and ensure that you have read & wrtie access...

Its a very common issue when copying show folders from other macs that the permissions are different and catalyst can't write back to the folder (ie save settings on quit)
Usually creating a new folder and copying the files in to it solves the issue...

S