I use mobile authenticator and the mobile AH, the latter because I like having something to do when I'm sitting someplace boring. Haven't had any problems with either as far as I know; nothing unusual on any of the characters I've used the past few days. I can check them all when maintenance ends, I suppose, but the real lesson here is this:
Spend all your gold on pets; leave no gold for hackers to take.
Goodness, the hackers don't know enough to cage and steal my pets, do they?