Are you positive that when you enter the passphrase in brainwallet it shows the right public address?
After you imported the private key in QT client, does this address show up in the "Receiving" QT tab?
Yes to the first
Yes to the second but it's the public address which is in the receiving tab
Thanks
Then there is no reason why you should not have the right balance in QT client.
What's the public address, if you don't mind sharing?