This is very similar to my experience. I tried everything I could yesterday to no avail and then I did a reinstall and ran around Il Mheg for a bit before logging out for the night. The next morning I go back to Il Mheg and I get the DX11 errors on login which now makes my character unplayable. I've already tried everything so there's nothing I can do but wait for them to fix whatever graphics bug this is that was introduced with the patch.