suddenly logged off empire

[Yeknom58]

I know I've seen a post on this before but it's starting to happen to me now, so now it's important. I'll be playing on party, then all of a sudden I get some message saying I just logged on another computer and I get booted. So either someone stole my passwords or this is some glitch. I have all the latest viruse stuff and crap like that so I don't think my computer got hacked but you never know. I just wanted to comfirm that this is a known problem.