aggie463,
This had happened to me once before.
but it was silly, becasue, I had two walls overlaping each other...ha ha...so I have to delete one of the wall, inorder for windows to interact with the wall.
probrably you check your wall first, see if you have 2 walls overlaps.
If not, then other Archicad masterminds will show up and come with a genius solutions.