I did some testing and I think there is nothing wrong with the blockchain or coin. The block explorer, statistics wallet, swap wallet, coinsmarkets and my local computer are all on the same chain. All are independend wallets. My PC wallet synced up perfectly from scratch. Current height is 70127, 280 masternodes online and 2595 MH/s mining power on this chain. Looks pretty healthy to me.

The new ZeroSolaris (zerocoin implementation) release will also contain new checkpoints. That will help the network.