Pretty often an old library (that no one have loaded) show up in our TW-projects. It's always the same library and it comes from an older project. I wonder if anyone have experienced the same and knows about a fix?
I got this answer from GS support (not much we can do about it):
This is an already known bug (DEF-8098). Normally AC doesn't copy the Embedded Library when Copy/Paste between Archicad instances, but in case of user defined materials, it brings it over to make sure no attributes are missing.
Workaround: Remove the MASTER_... gdl-s from the Embedded Library.
We now have a Bug Number. Perhaps all who are affected can start contacting their GS support team referencing the bug and asking when the fix can be expected. We've suffered from this problem for eternity.