Ever since either the Chrome 18 update and / or the 10.7.3 update (not sure which because they happened so close).... When composing a new email in gmail, the screen will flash. It's a similar flash to when your press screen capture on an IOS device. It's highly annoying. In Chrome it makes the entire screen flash. Switched to Safari for a few hours and it happened there too except the whole screen doesn't flash, just the safari window. Anyone else experience this?