https://bitcointalksearch.org/topic/electrum-194-stuck-on-synchronizing-336267
"I followed the steps for "How to make offline transactions using your Master Public Key" and now my watch only wallet (connected to Internet) is stuck on Synchronizing after choosing to restore from Master Public Key which I transferred from the offline PC. I'm pretty tech savvy and feel I've followed the steps exactly as I should and running into this issue. I have tried changing servers and same problem. Not a good start to this new wallet. Anyone else ever run into these kinds of silly issues? Keep in mind I've never used this PC for any other wallets and downloaded this for sole use as a watch only seedless wallet. My OS is Windows 8."
Answered and fixed
Thanks for pointing it here.
Solution: rename the wallet file and restore from seed/MPK, possibly a corrupted wallet file.