On my mac new mandatory update 1.0.3 works fine. If you note that 1.0.3 does not synchronize you are probably still on wrong fork due to a bad "blk0001.dat" file

1) close 1.0.3
2) make a backup of the file ~/Library/Application Support/Sync/wallet.dat
3) delete everything from   ~/Library/Application Support/Sync/   except "wallet.dat" and "Sync.conf" (if Sync.conf is not present, create it)
4) check that "Sync.conf" contains only these official nodes:
addnode=107.170.51.29
addnode=107.170.206.182
addnode=192.241.244.198
5) download bootstrap.dat from https://dl.dropboxusercontent.com/u/80376827/bootstrap.dat  and place it inside  ~/Library/Application Support/Sync/
6) open 1.0.3 and wait that bootstrap loads (be patient: it took on my mac at least 30 minutes)
7) as soon as bootstrap import ends, your wallet will synchronize fine