Someone posted information about a POS coin that sounded very good and it was hard for me to track down the wallet or information. It doesn't have an announcement here. A saw a lot of posts about it on another crypto site, and bounties given to addresses that were being posted in the thread. It was one of the bigger other sites so I trusted that it was real. I installed the wallet and bought some of the coins and after that I got a block index error which I posted below on several of my wallets. The only one that didn't seem affected was 808 coin. I read that to resolve this, just delete everything but the wallet.dat and restart the wallet and that seems to be working (it was a secondary computer that didn't have a lot of valuable coins on it).
But, I'm wondering, if this could have come from the wallet? The wallet/coin is Koi coin. I titled this as "possible" because I don't know. I'm new to POS wallets and I wanted to learn more about them and as any tech knows, the way to learn is to solve a problem, often your own.