Hello, I get a strange question.
I write a shader script, it is not work when the U3D Editor window reactive ( win32 window lost focus and reactive it ).
I spent a whole day trying to solve this problem.
Finally, I found the problem caused by the Directory:"NGUI/Examples/Models/Orc". I remove it or move it to other directory, and then I have got fix it. Not files, only directory"Orc".
What a strange question.