http://bugs.winehq.org/show_bug.cgi?id=21842
--- Comment #8 from Kenneth Robinette support@securenetterm.com 2013-05-26 08:17:31 CDT --- The problem happens when you have a theme defined in the Wine Configuration/Desktop Integration. I have the normal Windows XP style selected using standard Microsoft theme components from XP.
This is running under Ubuntu 12.04.
So no, this is not a 100% clean WINE prefix, but I thought using themes was allowed.