http://bugs.winehq.org/show_bug.cgi?id=29758
--- Comment #8 from Janni K. winebugs@jn-games.de 2012-02-10 03:37:22 CST --- Sorry for the delay. I now had the time to test the problem in wine-1.4rc2 and it looks even worse. With this version, the form's background is not drawn anymore when the bug occurs and therefore is simply white where it should be updated (if you move the window to the back and to the front again, it is all white but the buttons and the link label).
Log is the same as in 1.3.11.