Hey,
I've been using NGUI for a while now and this is the first time I've come across this error, which is a strange one. On a certain machine of my client's company all the NGUI interface displays as pink boxes. I know when textures don't display properly in Unity they show up as pink. This though appears to only happen on a couple of the 50 machines my application is on. The one machine they let me look at is pretty ancient and I suspect the graphics card just can't handle the shader used. I wanted to see though if there are quick things I can do to resolve this problem.
Here are Unity specs:
Unity 4.2.1f4
NGUI 2.7.0
I attached a DXDiag screenshot to this post of the machine that is having problems. I'm trying to get a Unity log from them as we speak, I will post that when I get it.
Thanks!