...open Yahoo!, and sign into my? mail, after mail page is up, a box pops up on the screen with the words Windows Internet Explorer in the upper left corner, the center of the box has the triangle symbol with the ! mark in the center and it reads as follows: You have been disconnected from chat because you have signed in to Yahoo! Messenger from another computer or device. So, what does this mean? It just started popping up recently. Thank you!