http://bugs.winehq.org/show_bug.cgi?id=14497
--- Comment #11 from markk@clara.co.uk 2010-06-28 12:36:33 --- This problem does not affect only text. The background of some graphics which should be transparent is opaque (black). I guess that could be due to the same problem?
In the pointer trails screenshot I uploaded, notice how the background of the aeroplane mouse pointer is opaque blue; it should be transparent. Also compare the screenshots of the new game screen which I'm about to attach. Notice that in the Wine image, the background of some icons is black. Compare with the Windows screenshot.