A friend of mine brought some files over to work on at my house, he has recently upgraded to 2011 and I am still on 2010, after trying to get his files to play I stopped getting several of the midi tracks to play. If I opened the same tracks in realband they would build and play fine but not in BIAB, additionally and now more importantly, my own files will no longer play correctly on my own computer. Could settings in his 2011 files have corrupted my program? And How can I fix it?

I'm using 2010 everything pac running off the ex HD