Clicks and pops when mouse passes over certain Sonar widgets

Kingston still (yesterday was a long day of mixing, so I found a few things). During playback, when moving the mouse over track names or the mute buttons (as well as a few other track buttons) audible clicks/pops can be heard. Never happened before Kingston and it doesn't happen anywhere else on the screen. Not a deal breaker, but it is annoying.
 
Anyone else?
 
Regards,
Dan