Themeing is a hack, anyone who uses Themes should realise this. You should switch back to Aqua before applying any OS updates (in the same way that you have too move all your Apple apps back to the places Apple expects them to be). I upgraded to 10.2.3 I then returned to the theme I was using before the update (even though it was the old 'pre-10.2.3 version) and every thing was fine.