just restored to my back up i made eariler when it was synced same thing stuck at 2 hrs with 19 connections. its block 649
block 902 now..
It may well take some time for it to go. seems like it did go almost 300 blocks or so for you.
just went an installed a fresh client on a diff computer and it synced no problemo. not sure why the one i am on wnet from synced to stuck