There was a bad timestamp attack and possible double spend (infamous 51% attack) on the blockchain a couple weeks ago.  The Dev has been addressing it with Blockchain updates.... block height 76000 is significant because of some of these changes as well as a difficulty algorithm change that comes at that height.  There may be more, but I'll defer to the Dev and the Pools Operators who may know more than me on these issues.  Bottom line, the blockchain had numerous forks in it as we got closer to the 76000 height, which is why the pools kept getting stuck and the blockchain was having to backup a few times.  Once again, for the second time today, we seem to be cruising right along and the blockchain is getting better.  We are awaiting an updated wallet from the Dev as v1.2 seems to be getting stuck prior to height 76000 for BC synchronization.  Payouts are on the chain, but my wallet can't read them at the moment.  Awaiting advice and/or updated binaries.