This question probably would be best asked in the relevant development forum but I have too few posts to post there.
My problem is that after successfully flashing the ARHD ROM v3.1 on my HTC ONE X, everything is fine until I try to open Facebook. Everything comes to a halt and I get an error saying that FB could not Authorize HTC Synch.Even if I update FB as suggested by another poster with a similar problem on the Dev forum, the problem continues for me. Even if I reboot, the phone responds so slowly that it is unusable.
In the end I had to roll back to my Nandroid backup.