rooo i just post the same issue...
Hi,
I just update to 3.0.f7 and i previously use : Time.timeScale = 0f; in my script for pausing game.
That seems now with Unity 4.3.0f4 (OS X) that just block all NGUI event.
Then now i can show the GUI but... that all no hover, click ...
Can you please check this ?
Thank you.