leigh2k14,
Did you use the same email and password for any mining pool or other sites?
No, I haven't mined for quite some time.
It's unique to bittrex.
so are you telling that your computer was hacked and that is how you lost your BTC's right . if you are having an unique password for bittrex then it is the only possible way.
We are still trying to establish weather it was our machines that were hacked or bittrex, having a password unique to bittrex doesn't make it un hackable.