The past couple of days the network has been forking randomly because of some issue with the masternode payment system. This is the first we've seen this issue (we ran masternode payments with nothing like this happening on testnet for a month). To remedy this situation, I am:
1.) Uploading a checkpoint to ensure clients are on the correct fork. If you're on a different block then http://explorer.darkcoin.io/ please pull the changes from the repo and run with -reindex 2.) Turning off masternode payments effective tomorrow. I'm working on a patch to turn off masternode payments and restore stability to the network. This should be done soon.
Some bad masternodes set off a chain reaction which forked the network into many smaller forks. To ensure you're on the correct fork please update your daemon and run with the command "-reindex". It may take a bit to reindex, but you'll be on the correct fork.