Oops, it looks like I did not read Uwe's original post very well. It appears I am looking at something different. Sorry about steering this thread away.
Dimitrie O. Paun wrote:
Can you please send me a screenshots of the images in question, before and after this patch:
Okay, here are three images. The first is taken with the original CVS patch in question backed out. The images look good. http://www.winehq.com/hypermail/wine-cvs/2002/09/0067.html
The second is what I get with the CVS patch installed. Notice that both the big icons and the toolbar icons have artifacts.
The third image is after your quickie transparent patch. Actually, that patch makes it a little easier to see what the artifacts are. Pretty clearly, the background of the "Design" icon contains the "Portal" icon. Similarly the backgrounds of the toolbar icons contain the images from the other toolbar icons. So it looks like perhaps an index is off somewhere.