I download and install ETH wallet 0.5.1 for windows 7/64bit
I start wallet, import my presale wallet and going to send some eth at poloniex.
But my wallet not synchronize, this screen infinite loading:
In Ethereum wallet window 0 peers as well.
Also, I can't send Eth on my Poloniex account, when i try to send, pop up error message like "Exceeds block gas limit"
Why all this problems appear?
And i wish to know how backup my ETH wallet or account.