those who cant' sync, do a getinfo
what is your protocol version?
if it's not 80001, update wallet
"version" : "v0.9.0.1-gdf9d55a-beta",
"protocolversion" : 80001,
"walletversion" : 60000,
"balance" : 0.00000000,
"newmint" : 0.00000000,
"stake" : 0.00000000,
"blocks" : 2497,
"moneysupply" : 49999947.80019200,
"connections" : 8,
dev wrote here several times those who don't upgrade their wallet won't be able to sync
I have the same version

{
"version" : "v0.9.0.1-gdf9d55a-beta",
"protocolversion" : 80001,
"walletversion" : 60000,
"balance" : ,
"newmint" : 0.00000000,
"stake" : 0.00000000,
"blocks" : 2497,
"moneysupply" : 49999947.80019200,
"connections" : 39,