Exchange Withdrawal Problems
When withdrawing your funds from an exchange always make sure to provide your account address and make sure you have a passphrase. Providing an incorrect account address or an account address to which you don't have the passphrase is a sure way to lock your funds forever. Writing the amount in the account address field or any other irrelevant info is another popular way to lock your funds forever, since some exchanges do not validate the account address before withdrawal. If the exchange also asks for a public key, login using your passphrase and retrieve the 64 character long account public key.