The new "KeepAlive" function seems to get caught in a "loop" when used with some applications. We've had reports of this happening with "Poser", and "Go Live" (also iTunes). If you get the "infinite pop" or "infinite boing", then turn KeepAlive off by going to Config | Clipboard Diagnostics.
If it only happens once, then simply shut ClipMate down (all the way) and re-start. But if it's habitual, turn off KeepAlive, and contact support so that we can go about solving the root cause.