"Another Login Has Been Detected"

Ever so often this window (about 1/2"x2") appears in the center of my Chromebook Screen and the background is then dimmer. Also if in the middle of a game the Timing Clocks for both players STOP and start flashing. In the middle of this window is an orange button (same color as "Post" button) that says "OK" so i press on "OK" as that is the only way to make this annoying window go away.

Figure this must be something Chess.com has initiated? Wish it said "NOT OK" instead of "OK"

Anyone else experience this annoying interruption ?? 

That message normally happens if you are logged on to the Live interface on more than one device, browser, or tab at the same time. 

What do you mean by more than one "device" ? The only device i'm using is my Chromebook. Are you implying that someone else is using my password ? Do i need to change my password? Sometimes that window appears in the middle of a game i'm playing.

For example, I have the app on my phone. If I'm in Live on my computer and open the app, I'll get booted from the Live connection on the computer. The app automatically launches Live when opened.

If I'm in Live, open another tab into Live, I'll get booted from the first session.

While it is possible someone logged onto your account, it is probably unlikely. The more likely case is there is a background tab with Live open and that causes it, since even background tabs can do it.

not OK would make you worry twice as much by the way