Smart Tool Right click+drag in PRV to select notes, get context menu instead

Using the smart tool in the PRV as per help file, Right click+drag is supposed to lasso select notes, but sometimes when doing this, I see the selection rectangle as I drag around the desired notes, but when I release the mouse button, no notes are selected and the context menu pops up as if I'd simply right clicked in an empty space. I can't come up with any specific scenario or repeatable set of actions that caused the behavior consistently. I just tried it about a dozen times alternately selecting two different sets of notes and it happened probably three times. But other times it will keep happening repeatedly and won't return to normal until I (seemingly) randomly click some other element in the interface.
 
Any one else experience this?

Yeah... sounds like the Right Click button is triggering again when you release the lasso selection. Try another mouse or be aware of any user misfires on the right click button. It's easy to accidently click again when releasing.
 
Cheers.