This thread made me aware of something I'm doing wrong, so I thought I should comment.
I used to have the same "master pro channel crash" thing happen, but it stopped after I installed X2a. But,
here's what I'm doing wrong.
I have very limited time in my life, so I often update a bunch of stuff at the same time while I'm in that mode. As a result, I don't know specifically what fixed the problem, so now I can't say "The problem went away when I..." But I did
something that solved that problem...wish I could tell you what, but all I know was that it was around the same time as the X2a update.
Obviously the right approch is to do an update, run the program for a while, do another update, run the program, etc.
Doh. And good luck!