I'm having the same problem, and this was after updating to v2.2, wiping out the forked blockchain, and letting it download again. getinfo output:
{
"version" : "v2.2.0.0-gf96a5a-noise23",
"protocolversion" : 60008,
"walletversion" : 60000,
"balance" : 0.00000000,
"newmint" : 0.00000000,
"stake" : 0.00000000,
"split threshold" : 30.00000000,
"blocks" : 684620,
"moneysupply" : 3995123.58842300,
"connections" : 7,
"proxy" : "",
"ip" : "70.173.239.125",
"PoW difficulty" : 1040.48052646,
"PoS difficulty" : 0.00080916,
"testnet" : false,
"keypoololdest" : 1417625103,
"keypoolsize" : 101,
"paytxfee" : 0.00010000,
"unlocked_until" : 1504112287,
"errors" : "WARNING: Invalid checkpoint found! Displayed transactions may not be correct! You may need to upgrade, or notify developers."
}
, yours is 684620.
Unfortunately, you have to re-sync again.