I think it is worth pointing out that almost all issues with computers, in fact life, too, are due to a combination of factors, not a single factor.
I do not have a problem with the mouse dragging the track view fader, just like several others who have indicated the same. I am also running X2a on Win 7 64bit.
So it is not logical to blame the issue on X2a all by itself. There must be one or more as yet unidentified factors that are combining with X2a on your system to cause the issue. If you can work with the others having the same issue to discover more common denominators, you might be able to give Cakewalk information that would help them diagnose the issue more quickly.
As it stands now, they don't have much to go on, since for some users, perhaps the majority, there is no such issue with X2a on Win 7 64 bit.