yea lol i thought it was a feature in cm because i came from liquid frozen yogurt with no problems
Not at all AFAIK... first I have heard the phone refusing to not vibrate no matter what running CM. Maybe do a backup and use clockwork mod and wipe data/cache, and also format the system and boot partition and do a clean install of CM and Gapps.
In fact I was running LFY before loading up CM. All vibrate settings work fine.