I think my latest nightly on my i747m Galaxy S3 was from 8th March 2014 and i just downloaded 5th April 2014.
I just flashed and the phone is stuck in a bootloop. Sometimes it gets as fas 6 of 85 update then reboots.
When i press power + volume up + home i get into cwm for 3-4 seconds and i see clockwormod almost booting up. Then the phone reboots.
i cannot do anything in cwm.