If you haven't yet... can you take a look at this post and see if it resolves the issues for you...
http://www.wowinterface.com/forums/s...ad.php?t=22313
The situation you're describing is a failed load which is always one of two things: the wrong version of nUI or another mod causing the load to error out... see if that post helps you and if not, let me know and we'll go from there.