Modeling with Blender, I’ve arrived at a stage where Blender refuses to add any more objects to the scene, oddly enough. I just use Space > Add > Mesh > Cube, but no object appears, even though it does switch to Edit Mode. Same goes for any objects, not just cubes, by the way.
Blender works perfectly with other scenes, and I even sent this ‘wrong’ scene to a friend, who could add objects normally. It doesn’t seem to work for me though, which, naturally, hinders me a lot.