When I play the campaign mode, in stage/map selection, when I press "Details" button, then "Leaderboard", it shows the following error message: "Unable to connect at this time. Please check your connection". How do I fix it?
DRM-Free version, not Steam.
Already created an account in-game.
OS Linux Kubuntu 14.04 x64
I also have a Multiplayer question, but I'll ask it in the MP section.
EDIT: The MP question, just in case