wave profiler just stops

I've got sonar 8.5 and I have been switching between a usb plugin (emu) soundcard and the builtin - anyway if I switch between mme and asio, the wav profiler goes to perform - but for the first time the profiler stops in the middle of performance  - just stops in the middle - I have to shut the computer down, but it doesn't finish performing the analysis - have never had trouble with the profiler function before - maybe it's a driver issue but does anybody know why the profiler would just stop and what I have to look at to fix it?  Thank you.