Have you gotten past this issue yet? I have had no such isdue, but I did no wipe prior to installing 4.8 and therefore no restore was needed...my suggestion to you (if you still need help) is to reinstall 4.8 (perhaps even re-download 4.8 first) as long as you are running a froyo rom you should not need to wipe, but of course backup first

your sync issues should be repaired as the rom will be fresh again, and you should be good to go... I haven't had the issue, so I can't test my theory, but I've fixed similar issues this way before...