Yesterday in my marathon phone call with Rob in support, he was able to duplicate the issue on his system (he grabbed one of my files to his PC).

Bob, I tried other methods this morning as well, including what you suggested... taking an existing track, save as new name, open the new file and it still produces the missing wave form. I have regenerated all Real Tracks on an existing (older) file, still no good.

From my testing so far, it looks like any file created with non-2012 software produces this issue, at least on my system. I created 3 brand new 'tunes' and they all work fine with no regen issues.