From the team:

"We have found a split in the blockchain. Please do not send any Bay while we investigate. Also please keep staking.

So, by the looks of it there will be a two-step fix. First we focus on getting everyone on the same side. That would be the Latoken side of the chain. While we do that, David and yshurik will work on an update that prevents this from happening again. We have a bootstrap for you that will take you to the right side https://github.com/bitbaymarket/bitbay-bootstrap/releases/tag/v1
Everyone that is in sync with chainz download that and follow these instructions:
1. Stop client/wallet
2. Backup wallet.dat / keys
3. Remove all files in data folder except wallet.dat (and testnet/ if testnet was used)
4. Place bootstrap.dat in data folder (for client) or data dir (for Qt wallet)
5. Start client/wallet
6. Wait 2-4 hours"