I am suddenly unable to view plug ins in Vegas. If i click on the Track FX button (when a plug is already on the track) the vegas title bar goes inactive but the window that would show the plugs never opens. If there are not yet plugs, the plug in chooser screen does open. When I add a plug it shows the corresponding button at the bottom of that window - when I click "OK" the window disapears and the usual plug view does not open.
All of my plugs still work in Sound Forge and Acid.

Ideas?