Stylus RMX Sync Problem

Just installed Project 5 V2 and have been trying to us Stylus RMX with it. I have SONAR 4 and Stylus RMX works fine, but in Project 5 V2 the various track get out of sync (I assume they are playing at different speeds). In fact, the get out-of-sync with respect to themselves (with no other instruments playing).

Anyone else seen this? Is there a fix or workaround.

I am using the WDM drivers. Should a just punt and try the ASIO drivers?

Thanks.