Regarding how that 11 BTC roll happened, this is very alarming and intriguing case since a similar case was reported on PD thread a week ago or so?
I read in the other thread that the guy with the mysterious 11 BTC roll happened after he posted a screenshot showing his 'secret URL'.
It's likely someone typed it in by hand, found they couldn't withdraw the balance, and so gambled it away.
Displaying secrets on-screen isn't a great idea, especially when people post screenshots so often.