Comment 9 for bug 586729

I used a customized QT 4.6.3 build which fixes visual curruptions on Windows. The patch can be found here: http://qt.gitorious.org/qt/qt/commit/38adb59a9e80a23d37ff0820ef62ebd45ab1e4ae

Works fine on very fast systems but on older systems it may decrease performance (I still hear disturbing noise on my old sony vaio, dual core 2 duo, 2 Ghz RAM, Windows XP and Windows 7 x86, Audio 4 DJ at 5ms)