AFAIK, the framing option with the wall accessories that are part of the Goodies downloads has not been modified since version 6.5 or so. Corner windows came after that, so I'm not surprised that it doesn't do anything meaningful.
You'll either have to frame it manually, or take a look at the CadImage tools to see if their framing tool can automatically do it - or at Encina's FrameWright for a manual solution that has other features / power.
Karl
One of the forum moderators
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