Not sure if this is just a 9.1 upgrade thing but my extension manager gives me error 2 messages when I try to open it. I have to go in to the preferences and trash the preferences (not the whole folder) in order to open it. Once I change or check whatever I needed to do I'll close it and try to reopen it (just see if it works again). No deal. I still have to otrash the preferences.
Anybody else experiencing this?