Based on the errors you described I would say there's a problem with the installed instance of your ARCHICAD 21 and/or you do not have administrator rights on your system (or the access rights are not properly set).
First I would completely uninstall ARCHICAD 21 with all of it's contents, and do a clean reinstall. After that (or even before) repair the disk permissions
If that doesn't help, then the problem is deeper, and I think that you should contact your local GRAPHISOFT Technical Support Team for some hands-on assistance. In the meantime (as I understand) you can work this issue around by using ARCHICAD 22 and saving the project back to 21, or opening the IFC files on different computers and then moving the PLN files to yours.
As a general suggestion, I also agree with the others about that I prefer parametric objects. In most scales they display properly, and I usually just download the details from the vendor's website and use them in detail drawings only. If that's not quite your speed, I think BIMobject
has a better selection of native ARCHICAD parametric doors and windows, of real products.
Daniel Alexander Kovacs
Technical Support Engineer
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