Yeah, I always try few hours of work to recover, if I know I did nothing wrong
And I know the devs here like to have the solution posted as well
Sooo now you people know: if you delete your scenes from the project and they are in the BUILD list, the build command will create errors that will block Unity from loading the plugins WITHOUT ACTUALLY GIVING ANY ERROR to help you find the problem!
Maybe I should post this in the Unity forums as well, because this is NOT a Playmaker thing...