hasn't happened before. no new system additions... when i double-click breverb or th2 or transient shaper as i usually do to tweak, there is no response. no gui pops up. i know the mouse click is being registered, but no response from sonar. restarting sonar doesn't help. i'm dead in the water... EDIT: OK, called tech support. they nailed it. seems that the x,y coordinates of where the windows (like breverb...) open up gets lost by Windows. The Fix: Change your screen resolution temporarily and revert. this causes the slate to be wiped clean, and, presto, sonar now has all its windows. worked for me...