[DS] The game viewport will sometimes stop updating
This happens when the monitor flickers when opening a game thats in fullscreen mode or windowed fullscreen depends on the game you open, this issue is present if you have 2 monitors aswell. Games that are on Steam for example.
What supposedly is the case so far (it'd be nice if you can confirm) is that not only does chat keep updating, but so do statpanels and position-sensitive verbs. If that's the case, it means that the server-side map loop is running and its messages are being sent, and there's a limited selection of things that can impact this on the client.
I just merged in another thread on this issue where I discussed some of the logistics of this, and a possible experiment to try the next time it happens.