Well, problem solved, I don't know what the problem was though.
I ended up tinkering around with PMS and other shit on my PC, restarted the program a few times, and then noticed that it wasn't detecting any Renderers now.
As a result I taskkilled Javaw.exe (there were 2, must not have closed properly) and restarted. The renderers came back and apparently fixed my original problem.
Though restarting it before the "no renderers found" problem didn't seem to fix it. Whatever, it worked out in the end.