There seems to be some issues with the new Slate look. Running latest Java, 10.0.3, Mac OS Lion 10.7.5.
The issue is strange. If I open a catalog the gui is correct, dark slate look in all windows. When I edit some fields and click between tabs and generally operate the gui parts of the windows become a lighter grey. The tree section seems to remain the dark slate look. I am running one production group, so one set of preferences, set to slate look.
I have not seen this before but when stuff like this pops up it usually is traced back to a graphics card conflict. Send along these screen shots with a log from the client (under the help menu) to firstname.lastname@example.org and they can take a closer look. Include any pertinent system spec too OS and what not.