To solve the 7806x issue I did the following (on Windows):
- backup wallet.dat
- delete content in C:\Users\XXXXX\AppData\Roaming\B3-CoinV2 (except wallet.dat)
- open wallet (to generate default files)
- close wallet
- copied borngreat's b3coin.conf file (see #b3-wallet-announcement)
- open wallet
- let it sync from the beginning to the current block (78026)
