[Bug 24236] New: SynthMaker GUI not drawn completely

http://bugs.winehq.org/show_bug.cgi?id=24236

Summary: SynthMaker GUI not drawn completely
           Product: Wine
           Version: 1.3.1
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: gdiplus
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Created an attachment (id=30514)
 --> (http://bugs.winehq.org/attachment.cgi?id=30514)
Screenshot in wine-1.3.1-399-gcc94570

Now that bug 15425 is fixed SynthMaker starts up successfully with
wine-1.3.1-399-gcc94570. However, the GUI is not drawn completely. Parts of the
background behind the window can still be seen (see attached screenshot).
Minimizing and later maximizing the window makes the problem worse. With native
gdiplus everything works fine.
Terminal output is not very interesting:

fixme:dsalsa:IDsDriverBufferImpl_SetVolumePan (0x1abd08,0x1ac890): stub
fixme:dsalsa:IDsDriverBufferImpl_SetVolumePan (0x1abd08,0x1ac890): stub
fixme:dsalsa:IDsDriverBufferImpl_SetVolumePan (0x1abe20,0x1ad4a8): stub
fixme:dsalsa:IDsDriverBufferImpl_SetVolumePan (0x1092ec0,0x1ad4a8): stub
fixme:wininet:CommitUrlCacheEntryInternal entry already in cache - don't know
what to do!

I also got a +gdiplus trace, but it's 2.5 GB (50 MB bzipped) :(