Relatively new (2-3 months) Mac Airbook running 10.8.2. Active window flickers approx. every 10 -15 seconds. Desktop display does not flicker. Issue is present in Firefox, Office for Mac apps, Preview, Mail etc. Haven't tried all apps but I am guessing it is a persistent (consistent) problem. Any advice welcome.
MacBook Air, OS X Mountain Lion (10.8.2)