Screen Problems with selector cross

Hi

I am using Prostructures and on my laptop when i have two other screens attached, the cross selector (im sorry if not correct name) that is usually white on a black screen like wireframe and white with a black shadow on a white screen like illustration stays black and i cant see it on wireframe views.

When i revert back to just my laptop, the cross goes back to the original white and white and black shadow

I cant seem to be able to change it