Ok in the middle of mapping I did something while holding [ctrl]+[shift]+ dragging (I was moving the cam at the time, but must of not had the pointer on the cam window)
Anyway now there are two pink lines in the map window [in XZ front + YZ side only] and a pink triangle in the Z 'slider' window.
and it only loads in maps parts that are in between the two pink lines.
I've reset My laptop, and it still remains. WTF did I do??? and anyone know how to fix it????

ok, fixed it somehow by just [ctrl][shift][dragging] all over the place,,, lol

Those are part of a cordon box. You will see a button icon in the top of the editor that looks like yellow and black stripped caution lines when these are active. It allows you to render only the section of map within that cordon box. It renders faster for little tests.

oh kewel thanks, that could be handy, when it's done on purpose. lol
it freaked Me out when it didn't go away after reseting.