The last transaction I have that makes sense - i.e. that both the wallet and the block explorer both agree on - was a block I mined on 10 April 2008.
Everything after that is rubbish.
I'm sure that address still has the coins, but I can't access them with the 6.0.0 wallet.
Hey my friend, had the same problem and finally figured it out.
Just start the gui from a command prompt and add -reindex aka hodlcoin-qt.exe -reindex
You can also add the command in the properties promps.
Best