"Account used elsewhere..."

every time I try to join a game in gmod, it tells me I’m logged in on another computer, and that I need to log in again or something. I’ve logged out and in tons of times, and the only other computer I was on was my laptop, which I logged off of, and is turned off right now. I can play every other game fine. =/

change your password

Ok, i had this problem. As suggested, i changed my password - It could now connect servers. And even better: When changing my password back, it still works!

I don’t think my account has been hacked though, because as op said, other games run fine.