Ok I know I have done this before, and I have also read the recent multitrack drum comping thing but somehow this is not working for me. I have two tracks of guitar (mic and DI) that I'm trying to comp and for someone reason they won't link. I've tried quick grouping, putting them in a folder, making sure the take numbers and recording numbers (on the clip) are the same.... it's not doing it.
Is there anything I'm forgetting? Looking through Cake's help database doesn't give much info on doing multiple tracks in one go.

Are you using X3?  This is a new feature that was not in X2

Yeah sorry if that wasn't clear, I'm on X3b 64.

The clip isn't locked is it?
 
If they are clip grouped they should respond as one as long as they are in the same group.

Not sure what could be wrong.  It works as expected here.  Do you have an ability to upload a small project  somewhere?  I'd be happy to try it out on my machine and see if it works here.