I posted this elsewhere, but after reading the symptoms here, I think this thread may be a more appropriate place for my comments. I'm having similar issues when automating with a controller connected to a 32bit VEPro slave running on an MBPro, using the VEPro Event Input Plugin, in a channel in Reaper on the host machine. As the original post mentioned, midi messages don't seem to shut off properly. I had thought that I was in some type of midi 'feedback loop' at the time, but a lack of midi-off messages makes more sense. Once I scrapped the VEPro Event Input plugin, and ran my controller and automation from my host DAW everything went back to normal. I originally moved my controller from my DAW to the slave to free up CPU cycles. Any help from the VSL folks or anyone that's run into a similar issue would be greatly appreciated. :) Best, Jason. Setup: DAW = Reaper on Win Vista 64, Core2Quad, 8gig Ram Slaves = MBPro's on OS X (Lion)