xubuntu 13.04: gtk3 themes broken?

[Kristian Rink]

Folks;

running Xubuntu 13.04 current builds on two different machines, I just
recently am experiencing issues with theming in GTK3 based applications.
Please see image attached (gthumb menu). Tried GreyDay and GreyBird
theme it always comes down to these black lines between menu items, plus
fonts looking different in menus here and there, too.
Is this a known issue or just my machine? Anything to be done to track
and eventually resolve (or at least work around) this?
TIA and all the best,
Kristian
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