My maple is glitched or something

Is it just that screen or is it everywhere else too?

I've seen that happen [repetitively] on my too-slow graphics card I had to temporarily use once. All the maps' backgrounds ended up looking like that -- where the bottommost layer (the sky) should be but ended up with green thingmajiggers like you see on yours. I'd show a screenshot but I'm too lazy to dig up my hard drive..seeing as how that computer's now dead.