This is really weird. Please help.

According to CryptoBlox I have received 26515.298348 TALK to my address (CT7QDdCKTVGbaXLmBzGHgxcsq2wRaYLBqp) in 7 different transactions including the Airdrop and the smaller donations from various members:
http://explorer.cryptoblox.com/address/CT7QDdCKTVGbaXLmBzGHgxcsq2wRaYLBqpThanks to everyone involved with that.
I haven't checked my wallet since I created it with wallet version 1.4.0 and today, after I read the Airdrop was over, I had a look and none of the transactions are showing and the balance is zero. I am using the latest client 1.5.2 on a fresh blockchain sync and I'm on the right chain as per CryptoBlox. And I haven't made any other transactions myself nor mined.
I tried "repairwallet" and "checkwallet" in the console and the checks passed but that's as far as my knowledge can take me.
The wallet seems ok as both repairwallet and checkwallet return "wallet check passed" : true.
Any suggestions on what else can I try? How do I find my private key? Can the private key help me get the transactions back?
Thanks in advance.
Does the address CT7QDdCKTVGbaXLmBzGHgxcsq2wRaYLBqp (public key) show up in the Receiving tab? If not, the only thing I can think of, is that you deleted the wallet.dat file, that contained the address , when you deleted the old blockchain. Try to look in your Recycle bin to see if it's still there.