Dedicated server only? Server hosting denies client on same PC?

[Rongor]

So far I always hosted MP games for my mates and me with my PC while selecting also my client role in the briefing.

Since 1.2.6, after starting up the server, I can choose my client role but the screen then remains in this state:

After unpausing, I hear by environmental sounds of the selected role, that the mission is loaded and I am in fact at the desired position ingame. But the screen doesnt switch into the ingame perspective. It remains in the state of the screenshot.

What am I doing wrong if this isnt buggy?

[Rongor]

Ok, it seems THIS thread deals with the problem. Maybe someone could edit the thread title so other ppl like me that experience this bug can more easily identify the problem discussed in that thread...