i worked out that F3 enables debug mode but how do i use it?

I have a Problem to start Ludo Online on my Mac. It tries to start, but then the full-screen window disappears and the desktop reappears. However, the program remains started. Please help me. Until recently it also started normally... I can't use my windows system either, because it has the “whole board is black” problem... Re-Installation does not work. Put Ludo in the developer-tools is also not the solution to the problem....

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Would somebody please be so kind as to elucidate the unlock condition for said achievement? I've tried various things, but to no avail.

It allows remote, but that doesn't work right. As recently as yesterday, it allowed me to invite friends directly. What happened?