Cannot cancel bounce

XPlat user here, recently switched from X3. Lately I find out that when I am bouncing to tracks, I cannot cancel it with ESC key or clicking the X button in the Transport module. If I turn off fast bounce, then I can cancel. What's weird is that if I hide the control bar and bounce, a dialog box will appear showing the progress bar and a Cancel button. If I click on the Cancel button many times, the bounce will not stop, but once it stops the Now Time will suddenly move around, matching the places where I clicked around the Cancel button. It's as if the clicks don't register until the dialog box disappears.
 
I was able to cancel bounces before, so this is a new problem to me.
 
Has anyone experienced it before?

bitman, yes that's weird. Thanks for chiming in though, don't worry about the helpfulness. :)
 
Bakers, if you happen to be reading this, any ideas? Does SONAR handle mouse clicks for the Cancel button differently under fast bounce and real-time bounce?