There seems to be a deadlock of some kind in the network code .. can you let it run for an hour or so ..
I remember people reporting that after a while they synced up again ..
Alternatively you can try to connect to the seednodes manually:
    "178.62.50.61:1776",
    "178.62.50.61:1777",
    "178.62.50.61:1778",
    "80.240.133.79:1776",
    "80.240.133.79:1777",
    "5.101.106.138:1777",
    "5.101.106.138:1778",
    "128.199.137.122:1776",
    "128.199.137.122:1777",
    "95.85.33.16:8764",
    "180.153.142.120:1777",
    "84.238.140.192:42577",
    "5.101.106.138:1776",
    "61.129.33.213:1776",
    "80.240.133.79:1778",
    "89.187.144.203:8764",
    "104.131.35.149:1776",
    "178.62.50.61:1779",
    "178.62.157.161:1776",
    "188.226.195.137:60696",
    "auseednode.minebitshares.com:1776",
    "euseednode.minebitshares.com:1776"
in the console type:
network_add_node <IP>