Yes that is the address. So they would have to have access to the wallet.dat file then send them from my address, is that right?
It looks like they somehow got your wallet.dat file and dumped the private keys out and imported them to blockchain.info/wallet to spend. Likely because they don't have/want to sync the blockchain.
So it sounds like you've actually been hacked and it's not a technical bug.
These are all your addresss to?
http://blockchain.info/address/1Kniun52uhJjEdKJhW2QFzNNjBmtvJetWUhttp://blockchain.info/address/1FEgzCSiXmBe966UDZnNUpwrziDv28P5dvhttp://blockchain.info/address/1HGQ4J7VPDsF88RsjXSZXchJRenfevtHR2http://blockchain.info/address/1MYvWmES69U2qP2kdHNwm9Gr4orp4K694RIt would be a good idea to post a list of every address in that wallet that had funds stolen when you get a chance. I'll take a look and see if we can find out anything about the hack from it if I have free time.
I would also NOT use the PC the wallet was on AT ALL.
Have a tech-savvy friend make backups of important files, and securely reinstall it before using it for anything important. However if you have another PC to use it may be a good idea not to do that right away as you'll want to figure out how you were hacked first to prevent others from being hacked the same way.
Did you keep backups of your wallet anywhere? was your wallet encrypted? if you use the password anywhere else CHANGE IT IMMEDIATELY from a secure PC, and change any passwords of other accounts you logged into recently on that PC. If you have any remaining bitcoin generate a new wallet on a secure PC and move them immediately.
What OS were you using? Do you have any remote control software like Teamviewer installed? Did you install anything Bitcoin or cryptocurrency related recently? what version of bitcoin-core were you running?
Whats the link to the minerals altcoin thread?