[Bug 10486] New: Rayman 3 Demo doesn't shows 'loading' screens (regression? )

http://bugs.winehq.org/show_bug.cgi?id=10486

Summary: Rayman 3 Demo doesn't shows 'loading' screens
                    (regression?)
           Product: Wine
           Version: CVS/GIT
          Platform: PC
               URL: http://www.gamershell.com/download_1164.shtml
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wine-user
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Rayman 3 Demo shows white screen (totally - excluding top black frame
(unrelated bug)) which blank to gray and then again white..

Looks like back buffer/front buffer flipping.
After several flips there is a main menu of the game (in 3d, working correctly)

It broke at  8b42238b5b420d4ae13f863b3a8db70ccf143cca
    user32: Cache the window class name on the client side.
(I have found that commit via git bisect)

Before that it showed (after one bad white 'flip') a picture and a progress bar
at top of the screen (so we can see clearly a game is loading)