corner windows

Hi All
here I am again
I have created a model with a corner window. The window displays correctly in the model in all views and visual styles.
how ever when i go to the view to create elevations and a plan half the window is missing?
If i select an iso view while in the view tab it is still missing and only shows a standard window in one of the walls.

I have tried different size windows a and walls and the result is the same.
I have repaired and reloaded auto-cad but the result is the same
I have never had this issue in the past and have no idea how to fix it

can any one help?

I have created around by creating a new view and using the same model it worked fine
I am stumped

I have opened the view file to work on it and found that the window has changed again
I am stumped

SOLVED

I have worked this out so just in case any one else has the same problem here is what I did wrong.

I created a model of a house that required a corner window the plans supplied showed the house facing South in stead of North. I created the model as per the plans as it was easier than trying to mirror every thing, and then rotated the Xref in the view so that the elevations would be named correctly, ie North for the North elevation.
some how when you do this half of the cnr window disappears and doesn't show up in the plan view or any of the generated elevations, but does show up in the window schedule as a cnr window with two different length sides

The solution was simple turn the model around in the construct tab to the correct orientation.
why this should be is still a mystery but the problem is solved.

Thanks to any one who looked at this and tried to help.

The problem as usual was the interface between the chair and the key board.