I have the latest and greatest of everything. This has happened with 2011 version also.

And yes, if you want a stereo track, it should not erase 1/2 the track. Again, not sure what exactly causes this but it's happened multiple times and is getting frustrating (not complaining, just would like to know what's going on?).

I record my lap steel in stereo (POT XT into Real Band stereo). Mostly, this has happened to my stereo 'live' track and I can't get it back.

I've regen'd these drum tracks about 40 times and can't get the same fills I had with the original track. (multi-riff does not apply to Real Drums I just discovered).