In fact, installing libgtk2.0-0_2.10.11-0ubuntu3 (I downloaded the amd64 version, but the post reports that the i386 has the same effect on that architecture) solves the problem...
I believe this bug is kde related somehow...havent seen it reported by gnome users.
I can confirm this issue, running Gutsy AMD64 (compiz and kde-window- decorator enabled, nvidia propietary drivers).
I found a workaround here: http:// kubuntuforums. net/forums/ index.php? topic=3085219. 0
In fact, installing libgtk2. 0-0_2.10. 11-0ubuntu3 (I downloaded the amd64 version, but the post reports that the i386 has the same effect on that architecture) solves the problem...
I believe this bug is kde related somehow...havent seen it reported by gnome users.