Have you restarted AR Server after enabling record object relationship?
can you explain "hangs up"?
Recording object relationships has been covered a few times now on here, it must be noted that the intial building of the relationships when first enabled takes a large amount of time e.g. > 30 mins. The server will be unavailable during this process.
The above comment from "dhananjay" is relevant.
It might be worth trying your Dev Studio with a fresh 'Workspace' as I have found that the cache can cause issues.