(no label)'s to be expected, depending on how you used the import command.
If your balance still is 0, and you are sure we're talking about the same address, then this is a QT bug.
You can try the following:
- Create a new address in your QT wallet (QTA)
- Create a new wallet on blockchain.info (BCW)
- Import your private key to BCW
- Send the funds back from your BCW to your QTA