Can't use X2a. In track view the fader is like in a "jammed" state. While I am trying to move it, it doesn't move. Then when I release the mouse click, it shoots up to +18db. I can move the fader just fine in the inspector pane.
Sonar seems less snappy now too overall compared to without this recent update patch.
i7 920, 16G Ram Win 7 64 Sonar 64