I dont know if this is a new version issue or not, but, not knowing exactly what version I was using, I discovered in a project tonight I was unable to right-click-add a script to a UI element I had selected. The NGUI popup menu worked fine, but when I selected the script to be added, it did not appear in the component list on the object. This happened with multiple scripts (scrollbar, slider, button).
I can however add the script if I select the element and add it via the pull-down menu; NGUI -> Attach -> etc.
Despite that, my colliders ceased to receive any input. Everything is on the proper layer with the event masks set up correctly. I deleted the NGUI folder entirely, updated to whatever version was released in the last day or so, (so I am now running latest), and the issue is still present. I still can't right-click-add any scripts, and when I add from the pulldown menu, the colliders don't receive any events.
Thanks for any help.