I feel like the excuse SE put out is just a cop-out excuse, I have a 60hz normal screen and run at 60 FPS and get constant DX errors or force crashes, it feels worse than most indy games. There is absolute noway they properly tested this....

Why you would do such a major engine change on an expansion is beyond me, this should have been done prior to 5.0 or done on 5.01X patches.