The GTK-Qt Engine forces a uniform background color on Emacs that it fails to recognize, leading to a rather unusable result. (See the above URL for a screenshot.) My (rather amateur) attempts at overriding that color in ~/.gtkrc-2.0 or ~/.emacs.d/gtkrc went unnoticed by the engine.
Created attachment 2040 [details] Screenshot
Created attachment 2041 [details] Screenshot
This should now be fixed in CVS. Feel free to reopen if the problem still exists :)
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.