Incidentally, I am getting these same 2 errors---"Invalid Pointer Operation" AND "Access Violation"----with BOTH BiaB AND RealBand. To summarize, I have done the following:

Complete Uninstall Including RealTrack and RealDrum Sets
Ran Defrag, chkdsk, cleaned registry, followed by reinstall
Restored to factory settings,
Removed Vista Sidebar
Disabled Vista User Account Control
Continually start and restart BiaB/RealBand
Continually reboot computer

Additional note: I have been using BiaB on this computer for at least 1 1/2 years with only minor, easily-solved, occasional problems.

Additional observations:
1. AFTER getting either ONE or BOTH error messages I cannot get the file to work on ANY style, nor am I able to save it other than .MGU.

2. BiaB and some point in my working on the file, just decides on its own to generate a solo track. I go to edit and "undo" only to have it regenerate it time and again.