Audio Dropouts in Audio Snap 2.0

It would not surprise my that you get some problems with a tempo change that drastic, but it's pretty unusual for the result to be different from one playback to the next, unless maybe your PC is having trouble keeping up with the processing load, which could happen if your running real-time Groove-clip stretching on a lot of tracks.

Things can also get weird when you're applying real-time FX to real-time stretching. If you haven't already, you should try working on a copy of the project in which you've bounced down the audio-snap stretching with bounce to clips, using offline algorithms appropriate to each track to render the stretching permanent. See the per-track rendering options in the AS palette, and read up in the Reference Guide if you're not familiar with this aspect of Audiosnap. I'll just add that for some material, the Same as Online option using the Groove Clip algorithm for offline rendering gives the best results.

Thanks much for your responses.
Brundlefly, I would think that my Core i7 (Sandy Bridge) 3.4 GHz with 16GB RAM would be plenty to handle stretching of 10 tracks, no? I DO have an instance of iZotope Alloy on the track in question, but even bypassing it doesn't change the behavior. (I suppose I should try disabling it and/or deleting it altogether before trying a bounce.)
Simple steps, CJ. I will try those as well. I've said it before, I'll say it again, this forum rocks!
P.S. Go Bills. Squish the Fish. 

Damn you, Brundlefly! Posing such questions when I'm at work and not able to test! Now I will go crazy... (Can't remember exactly how I did it. I followed a tutorial video on YouTube. Feel free to direct me to another. I was unable to get Audio Snap to work in a second test project file...)
Anyhoo, I will try this tonight. I know there is some measure of user error here, especially being new to this technique. (It's actually much simpler to do stretching in Propellerheads Record. But oddly, this particular song, unaltered in Record, sounds about 20 BPM faster than its native 140BPM. Yet, I've re-mixed another song previously in Record, also slowing the original tempo, with no BPM issues.) So last night per your and CJ's advice, I attempted to bounce the Snapped vocal track (soloing it first), but Sonar kept saying Processing audio data, where the black progress bar kept cycling through filling up, faster and faster (about 5 times or so total), then would just hang with an empty progress bar. I also tried to to do the same to an external audio track, with the thought of just starting a new project file to play with. Same behavior. I left it to "process" overnight, but found Sonar had crashed when I woke this AM.