I really don't think it's Hot Spot shield, because my friend still uses it to lock his account and mine. And I really hope they're not banning anyone who logs into one account from different IP's because that's a pretty ridiculous reason to be billingpp banning an account.
The rollback concerning NX that Angelique mentioned seems like the most probable theory.
The rollback concerning NX that Angelique mentioned seems like the most probable theory.

