Re-wire wierdness

I have a small project running one instance of Reason 5 re-wired (folder, synth and first audio out) with a few combinators (piano, percussion, synth, dulcimer etc.) and also a guitar and a scratch track that I'm comping from. It seems that every time I bounce a guitar clip, the audio from my re-wire track becomes garbled like it's under water. If I turn off the interleave on the re-wire audio track it will stop. But it comes right back as soon as it's turned on again. I have to remove and re-load the entire rewire device to correct the problem, just to have it start all over the next time I bounce a guitar clip. I've never experienced this before. Is this an X1 bug? or am I just doing something wrong? - Freezing the Synth seems to be a work-around. But I've never had to do that before.

Any Ideas?

Thanks......

HP AMD quad core - Vista 64 - M-audio Fast Track Pro