Drum maps with VSampler crashing Sonar

I'm revisiting this question now that I have narrowed down the problem and hoping someone can help. I have my drum samples loaded into Vsampler, lots of multi-velocity, multi-hit stuff. I can play midi loops OK if I split them onto separate midi tracks with separate midi channels for each kit piece. Composing and editing is very difficult this way as I can't see kit piece names and have to switch back and forth between midi tracks. I want to use one drum map on one midi track with each drum name, so I set it up using about 9 midi channels for different kit pieces in the drum map manager. But whenever I play a midi loop using the drum map, Sonar crashes at the end of play. It never crashes when I set up separate midi tracks with each on a different channel to VSampler. Anyone have a similar problem or any suggestions?