[Xrystal]

Carbonite has a known 4.2 problem so I would say at least turn that off for now and see if that is causing the problem.

The Loading process could be interrupted by any number of addons that you may have loaded that run before nUI has completed its own loading process. Hence the suggestion that you start with nUI on its own with no other addons. That will show that nUI itself has no loading problems. Then slowly add your important addons ( making sure you get the latest versions ) and start wow again. It's a lengthy process but it will help you narrow down the cause.

Did you deliberately disable your action button display in nUI ? If so then perhaps there isn't a loading problem, especially if you disabled the map because of carbonite usage.