I just upgraded to the latest NGUI in my 3.5 project, and then opened it in Unity 4 just to test things out.
I've got this problem where none of my UI shows up with the old settings. At runtime I've gone and changed the NGUI camera depth from 0 to 1 and that's displayed the main interface, but then other parts of the interface that I enabled via SetActiveRecursively don't display, and I'm assuming that they're buried "behind" other things.
Are there known issues with Unity 4? Anything that needs to be done to a project once it's converted over?