http://bugs.winehq.org/show_bug.cgi?id=4409
--- Comment #5 from Craig73 funrun73@gmail.com 2008-12-27 10:35:04 --- FWIW - I noticed this worked partially (briefly) for me in that I saw a gradient that seemed transparent, although once I moved the window it disappeared so I'm not sure. The only thing I changed recently was turning on Compiz again (it has been off for a while). I will provide an update again soon after I play with it to narrow down what appears to be happening.