A friend and me tried to play together. We're both unable to host a server - connecting over IP failed, ports are open.
After creating a new world, we navigate in the main menu to "launch your own server". We choose our created world. Now the game goes into window mode, nothing else happens. The back-button brings fullscreen back. There aren't any new windows hidden or on other desktops. This happens with the first and the second 'valley without wind' title.
Any ideas?
We're both on ArchLinux - up to date. I'm on Gnome 3, he's on KDE. Steamfiles are verified without errors. Game runs great with "LANG=C %command%" startoption.