and poloniex?
I've got this reply from polo support:

Thank you for getting in touch.

Correct, our copy of the blockchain is continuously corrupting itself and so we've not been able to sync the wallet. We have received offers of help from the XCN community and our team have tried using their suggestions to resolve the issue, but still all to no avail.

Know that we always do everything possible so as to ensure that wallets are back up and running as promptly as possible. Rest assured that if this could have been resolved by now then it certainly would have.