I'm running PTW 2011 and RBW 2011.5 build 3.
When I try to open a Midi-to-Sequence file created in PowerTracks in RealBand, it locks up RealBand.
I'm using no FX, and Midi tracks only. This Sequence file Plays without trouble in PowerTacks.
When this file locks up real Band I use Winows Task Manager to shut the program down.
Then I get the error message:

Access Violation at address 0047922F in Module 'RealBand.exe'.
Read of Address 000001B0 at 0047922F.

Then, when I reboot the PC to get a fresh start, I get the next error message:

1 Program needs to close
(waiting for) bbw2 window-NoName.SGU
This programs is preventing windows from Restarting.

It looks like bbw2 has made a call, and is not getting the required response ...