On occasion when I log into Yahoo email chat will open briefly then a window opens telling me I've been disconnected from chat because I've logged on using another computer. Are they trying to say I'm logged in at that same time on some other computer? Sometimes I had just previously been logged into Yahoo email on another computer, but always had logged out of Yahoo on that machine before I log in on my personal computer (the other one is the work intranet machine and won't open chat because of company blocking). Sometimes it will work after I close Yahoo and log in again. I'm wondering if someone has hacked into my email? Thanks!