Oops, I see this has already been entered as a bug. Still finding my way around the site.

Sorry!

<t>When I try to put one window above another in a wall, both disappear, leaving only an outline of both. If the one on top is narrower than the one on the bottom, the lower one disappears only for the width of the upper.<br/>
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I tried various thicknesses for walls and windows, but nothing ...