I'll start by saying that I just installed LMDE last week and, so far, I'm loving it. I have used Ubuntu for several years, but recently set up Debian on a couple servers and really liked it. LMDE has really brought a nice layer of polish to an awesome OS.
When I first set everything up, I installed Gnome-Do and it worked great. It still functions just fine, but after a round of LMDE updates, something broke and it looks awful. I have compiz enabled and all other compositing looks fine. I thought maybe it was a problem with Gnome-Do, so I removed it and installed Synapse, but it has pretty much the same problem. See the screenshot below:
The whole Gnome-do window should be black and the shadows are all squared off. I'd appreciate any help you can give me.