Delete please.

[Cranky Old Man]

I haven't been here long, but I've never heard of this problem.
When you say that you can see the maps fine in the editor, does that mean that you can load maps through the menues, but that anything beneath that isn't responding? If the menues wouldn't work, I'd suspect that some other program was stealing the focus of your editor window.

No, it's basiclly like I can launch the editor, I can open the maps, open all menus, it's just that I can't move around the camera. I cannot use the controls which always worked before.

Pardon the question, but while you changed computer, did you forget that you must hold down Alt and push a mouse button while you drag the mouse?