Black bars in titlebar in XFCE

[fog]

Hi guys,

I'm getting black spots in the titlebar of xfce apps. Themes with rounded edges in particular have black where the rest of the window (if it were a rectangle) would be. This can also surround the icons.

Not sure if this a common problem or not, but I couldn't find anything with a bit of searching, so I'm hoping someone can at least focus my efforts.

I'm running xfce 4.2.2 (I just emerged it today, wanting a new window manager), with Xorg (6.8.2?), on a 2.6.11-gentoo-r9 kernel with the nvidia drivers. (I actually got the newest version and rebuilt my kernel today too, having seen that new ones were out.)

Is this an easy fix?