Image effects not working for iOS?

If I try to add an image effect (any of them, but currently using glow), the game screen is pink. If I switch to Web player, all is well. Any settings I am missing that would allow this to work? (I have dev 4.2 from apple, and unityPro 3.2) Thanks in advance!

build settings–>player settings–go to inspector – target platform iphone universal which includes open gl es 2.0.