My wallet was stuck at 41299. Same as the Block Explorers:
http://cryptoblox.com/chain/CornerstoneCoin.
Unfortunately, I had around 1.8M coins in staking stage. After re-download the blockchain undoubtedly the staking coin were gone.
Just tell someone else remember to backup the wallet before the wallet begin to stake. That's the way to get the coin back from wrong blockchain. Or is there other ways to save this situation that I didn't know?
The coin age shouldn't be lost if there isn't a confirmed transaction for the coin stake age. However, if you really want to be sure one can always use the repair commands..And in the most extreme case one can rebuild a wallet using only the keys and force the client to rely on only the blockchain itself which is all that it could "see" at that point..It isn't that hard or even that many steps but it does take some patience and care.