I’ve been having exactly the same issue with GA3 and a 32 bit Vista machine running Cubase Studio 5…it won’t write MIDI data. I’ve tried everything, but without success, and even worse, when I load GA3 as a virtual instrument the main panel for it won’t open, it just runs in the background and is therefore uneditable.
I’ve no problems with other VST instruments.
I’ve had neither acknowledgment nor any response at all from Steinberg after my mail to them over a week ago.
Any ideas, if the J Bridge issue is only 64 bit?