Version 1.6.0.1 is the current release. Version 1.6.1.1 is slated to be released this coming week.

If your wallet appears to be stuck on a block for a long time, half an hour or more, perhaps give it a restart. Of course, make sure you have peers.

If the block hash of your highest block does not match the block hash of an explorer, you are in a fork. To make this comparison, note your highest block number, click 'explorer' in the wallet, input that number and click the 'jump to block' button. Then go to an explorer on the web (http://transactions.sterlingcoin.org or https://chainz.cryptoid.info/slg/ ) and input that same block number and click search. The block hash should be identical on both. If not, you're in a fork.

In the event you find you have forked (block hashes do not match), you will need to resync. New and more recent snapshots were recently updated on http://sterlingcoin.org (under the 'download' navigation menu). You would need to delete everything BESIDES your wallet.dat file within %Appdata%\sterlingcoin to remove the old blockchain. Replace with the contents of the snapshot archive or allow to sync over the network from scratch.

Again, use caution to not delete your wallet.dat file.

I hope this information is helpful. If you need further elaboration or help, please feel free to ask.