Sorry, spent the last couple days investigating the issue, so I haven't been very present...

There was an old bug laying around which has been causing some blocks to be rejected when they shouldn't have. From the looks of it, there is no fork though, which is fortunate. Most clients just stopped syncing past height 51712.

I have pushed an update on Git for those running *nix, you can go ahead and recompile the new client. As soon as I get home, I will publish an updated Windows client, unless some good soul wants to take care of it before I get a chance.

For those transferring coins to Cryptsy, they are not arriving most likely (this is pure speculation, I cannot state this as a fact) because Cryptsy's client is stalled too. Once they update, you should receive your coins.