I am a user of REALBand 2011 and BIAB 2011

I'm having this access "access violations errors" when editing a midi event in a midi track, the program can continue but I have to erase the midi track in order to avoid getting the access violation error on screen, also I have kontak4 and can not load it in REALBand but I'm able to load Garritan Big Band VSTI with no problems, any suggestions on how to solve this issues?