I updated to v1.2.1 and the prompted for the blockchain to get rebuilt so I hit ok and waited but ran into a problem
It gets stuck on block 100160! I have tried deleting the data directory plus adding all nodes and starting from scratch with the same result.
seems to be a bug not sure if its across all platforms.
I'm on windows, so for me its broken
v2.1 has a problem with syn, dev is fixing, you go down version 1.2.0 and delete everything except wallet.dat, then sync from the beginning