I think you should do not process rollback. XDN and LOKI have some errors but they never process rollback, because miners must payout electric bill and sometimes it is a gift for miners.
But who's finding any blocks? My local daemon stopped syncing and I couldn't find any - even though the network difficulty is 74k and I'm supposed to find new block every 2 seconds. 
The largest pools haven't found a block for 8 hours as well.