Sometimes when the phone is sitting around, and a call comes in, I get the Stock Android Answer screen. with the radial in the middle. Then sometimes I get the TouchWiz answer, with the Green slide on the left, and the red slide on the right..
and sometimes I answer and I get the Stock look and then when I answer, I get the Touchwiz answer. and when that happens, after a few min, it hangs up. It's so annoying.
I even tried the middle button to answer settings, and that does not work most of the time.