[Bug 15669] New: Lego Loco hangs on startup attempting to play back intro video

http://bugs.winehq.org/show_bug.cgi?id=15669

Summary: Lego Loco hangs on startup attempting to play back intro
                    video
           Product: Wine
           Version: 1.1.6
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: user32
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Created an attachment (id=16729)
 --> (http://bugs.winehq.org/attachment.cgi?id=16729)
Lego Loco thread backtraces

With today's Git (wine-1.1.6-314-g36d0140), when attempting to start the Lego
Loco application, the application simply hangs on a black screen. A bit of
tracing shows the hang to be due to the mciavi asynchronous playback thread
being blocked in a ShowWindow call:

if (!(GetWindowLongW(wma->hWndPaint, GWL_STYLE) & WS_VISIBLE))
        ShowWindow(wma->hWndPaint, SW_SHOWNA);

which seems to suggest that the problem lies in user32. Thread backtraces and
trace logs are attached.