And its gone again...

I only have this problem when I have too many shaded polygons on my screen. I was trying to take a short cut. Instead of finishing the home made symbol set I was going to use, I was making each house on the screen with shaded polys.

That will teach me!

I'm going to have to finish the set, which will take a day or two now, but I'll catch up very quickly once I'm done, because I'll just be pasting symbols then