Black artefact in fbx model in UDK 4.22 ???

Hello everyone

I just installed version 4.22 of UDK and when I import my model in .fbx, I have black artifacts on it that I did not have on the 4.18

I enclose two images with exactly the same import procedure on both versions

My .fbx is fbx 2012, I tested in binary and ascii, same problem …

Who would have an idea to solve this problem?