Hi,

First tried this as even thought you may only see one address on your "Received coins" list your wallet actually has close to 100 address already generated.
So from the "Receive Coins" tab click on "New Address" most likely the new address that would be listed is the one you are mining too.


According to the block explorer that address has mined at the time I checked.

119 Blocks and there was one 500CPTL transaction that was sent to another address.
 leaving a Balance: 45490.419 CPTL

Your wallet should have that address with that balance.

Go to
 Settings>Options
Click on
 Display
Check both of the boxes on that screen.
Click on OK to save the settings.

Now click on the "Send Coin" Tab
Now click on "inputs.."

On the screen that show up you should see all your address with their balances.

Also check your miner as some miner let you specify what address to mine to, which could result in the issue you are having if you enter an address from another wallet.