I have searched the forums and Google for possible solutions. I have deleted numerous prefrence files related to any audio software I can think of that I have had. The only obvious ones I know I have installed are Cubase and a Digidesign Mbox (not MIDI but anything audio related).
I also deleted several MIDI filders from Mac HD > Library > Audio. One folder, "MIDI Drivers" appears to be a system folder and won't let me delete it. It is empty.
Some imrpovement but still no solution. GB launches to the point of the open project window, select instrument, etc. It fails to fully open then and hangs once again with same MIDI conflict error.
Very very frustrating! At a loss...