Every so often my Ubuntu install goes a little weird. When I mouse-over any window decorations, or interface elements in some apps, they vanish. The window itself is still visible, just empty. I can't take a screenshot, because if I load a screenshot app I can't see what to click to grab a screenshot, so here's a photo instead.
I don't know what's causing this. The interface elements are all still click-able; I can maximize windows, open items ... everything, if I click in the right place. I just can't see what I'm clicking.
The global menu bar loads fine, and I see all menu options in the bar, but not in the drop-downs. My dropbox icon is visible and functional, and the drop-down menu loads on click ... but it's empty.
What could be causing this, and how can I get back to a working interface without restarting the machine or logging out?
I'm using 13.04, Compiz/Unity with a GeForce GT 640 card with the Nouveau driver.