Ok delete the blocks chain and sql folder in appdata and synch from the start.
It didn't help either, still stuck at the Synchronization stage (0 hours remaining).
Boiar, I saw that error as well!
what happened ~around~ block 51509 (16 hours ago)?
All of my 5 (five) wallets seem to be stuck there.
Some machines say, wallet file was corrupted, some just wont sync.
Backups wont sync either. I have been looking into it since I woke up.
How could I possibly recover?
Yeah, same problem. Don't know what to do.