You are not alone. I am having problems with the width as well. I emailed Graphisoft about this issue but received no response. For me, the window height is correct but the window width is automatically converted to decimal inches. My workaround to this issue has been to use a schedule created in version 20. Then the width value from the previous version works for me as you can see in the attached images where the version 20 width is the second column and the version 21 width is in the last column.[/img]
Check which dimension you're using in the window setting; nominal, rough, etc. You might have some spacing dimension set between the jamb and the framing, but only in the width, but not the length. It's worth a shot.
This is actually a bug, that we know about.
All the background calculations in ARCHICAD are actually based on meters (whatever units you are using, the calculations are done in meters). The problem here, is that the algorithm we use to convert the results in the model and in the Interactive Schedule Add-on slightly differs, and the results after the conversion end up a fraction of a mm smaller in the Interactive Schedule, and since it seems smaller than 1', it will convert to 12" instead. The displayed value is actually correct, it is just in the wrong format.
This bug is on our to-do list, but it is deep in the code, so we are still working on a way to make it happen. I understand your frustration about this issue, sorry about the inconvenience!
Daniel Alexander Kovacs
Professional Services Consultant
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