could you locate the "bitshares_client.exe" executeable in the install directory and run that instead of the GUI ..
a terminal window should popup stating some stuff about network, maybe replay, and or connections to the seed nodes ..
if you see ">>>" type "getinfo" and press enter ... the results should give you a number for "blockchain_head_block_age" which is in the seconds or minutes ..
if not the client will sync with the network automatically ... which will take some time ..
if something else happens, just paste the results here.