Internal Error During Mixdown

I've got the same thing happening on a couple projects. I've done a couple workarounds.
One was to take the tracks that were causing the error out of the track folder. Not sure why this makes a difference but it did. The other was to delete to corrupted clip and re-record it. The project usually stops playing just before the corrupted clip. Very frustrating. Never had this happen before and I've been using Cakewalk since 1999.

No external plugins. I tracked down the corrupted clips (a short vocal that repeats during the chorus). When I remove the Breverb plugin from the track, the problem goes away. Here's the dialog:

Some suggestions:
 

• If you're not using fast bounce, try it unless you're using MIDI FX. Real time bounce will be constrained by resources.
• Increase the latency. It could be that at some point, the system goes over the edge for resources and there's a dropout.
• Save the Breverb preset. Copy the track with it. Render the track with Breverb. Remove Breverb from the original track and archive the track.

Ricebug
Thanks, Anderton. What's "fast bounce"?

 
I thought by "mixdown" you meant exporting or bouncing to a track. Fast bounce doesn't relate to real-time playing, so ignore the bounce comment but do try the other two suggestions.
 
FYI if you select all the tracks and choose "Bounce to Track(s)," you can mix them down to another track. When you do that, you have the option to "fast bounce" the tracks. This is what I do with mixes so the mixed files are contained with the project.
 

I don't like how Sonar copies tracks (bouncing), causing the hard drive to become pregnant with a lot of files. In Vegas, you can copy a track or clip any number of times and it just "points" to the single file. But I love Sonar too much to ever consider changing my DAW.

 
Actually, both programs work very similarly. In SONAR if you copy a track by, for example, dragging a clip to another track, then SONAR just points to the existing file. Try it - open the Media Browser to the Project Audio Folder, and you can copy all day without seeing any files added. However, bouncing is a destructive edit, so SONAR has to create a new file and keep the old one for undo. Vegas doesn't really do bouncing (I wish it did; sometimes it would be nice to consolidate video or audio clips into a single file, although my workaround is grouping). The way you bounce in Vegas is to render the file, then bring it back into the project, which ends up creating another file.
 
Please report back if the other two suggestions made any difference, I'm curious now