Magicka Dungeons and Daemons co-op problem

[Robin Cederholm]

Hi andreadima, sorry for your troubles.
It sounds to me that you start D&D directly from the main menu and attempt to invite your friend? I know this is a bit old-school but when you do that you're actually starting a local game that is not listed online.
Using the Online Play option is correct, however I'm befuzzled about you getting to choose save games from the Adventure mode when you're selecting D&D in the host game option?

DukeJ is correct regarding the listing gamemodes issue, a solution is underway for that!

 

[Robin Cederholm]

a patch is just around the corner, hang in there!

Also I think there's a work around where you use the arrow keys instead of mouse to switch game mode.
Or try clicking the other direction than what you usually do, using the mouse.