Multiplayer Lobby menu does not render

Hi,

Since there is a free weekend on playing the base game, I got my friends to try this game out now. After they finished the tutorial, we wanted to set up a multiplayer game for learning.

When I open a game, or join a game in multiplayer, my computer only shows the background to me. I don't get the corresponding Menu displayed, can't ready up. This is the same if I want to host a game. I can set the privacy options, and then get the (beautiful) background.

My Friends can join the game, I am displayed in their games when I join, but I don't see the menu.

After cross-checking with my friends, I also can't use the competitive mode with the tachyon servers, but they can.

Offline play works like a charm, these issues are only connected to onine play via STEAM.

 

 

Is there a way to cross-check for firewall-issues or similar things?