I am having the same issue (Rev2 to Reason 12) controlling few vst`s...all rotary controls working as expected...only buttons not detected. I checked with Midi-OX if is there any activity once I press any buttons on the Rev2 and it seems to detect the signal.
I am specifically controlling the OB-X vst from GForce...and a part for the extra features such as effects and Xmod/Xenv, the synth structure is basically almost a 1 to 1 structure...with all the controls on the Rev2 it would be a perfect match.
Any advise on how to fix the issue?
Thanks!