Something's going on.  All my blocks being rejected with:

2014-05-07 06:02:50 ERROR: AcceptBlock() : rejected by synchronized checkpoint
2014-05-07 06:02:50 ERROR: ProcessBlock() : AcceptBlock FAILED
2014-05-07 06:02:56 Added 1 addresses from 54.214.242.184: 1037 tried, 13641 new

My height matches the block explorer and there have been no blocks found on the network in the past 2 hours.