[LVL ED] Graphic problems? Help!

[sacroid]

Hey everyone! long time I don't post in here ;P.
Well, I've just bought a new laptop, with a GEFORCE GT 540M and every game I have works perfectly and runs fluidly. Also Amnesia works perfectly, and the graphics are perfect. The only problem is in the LVL editor, where I see weird lightning, I can't set to fullscreen in the "Perspective" window, and the thumbnails of almost every entity are pitch black!
I would really appreciate your help! <3 Thank you!


Here's a screenshot for you to see...





P.S: And yes, I tried to upgrade my graphics card to the latest version and still the same problem :S