mike
it's a BGarchiCAD issue with library parts and network paths from what i can make out.
helpful workaround from graphisoft:
put a copy of the libraries you are using into the archiCAD
application folder/directory.
if libraries cannot be found for a project, archiCAD and BGarchiCAD both look for library in two default locations. the first is the folder in which the project file is stored, the second is the archiCAD application folder,
but it can only use one of these places at a time!. (i.e you cannot have one library in one folder, one in the other and archiCAD/BGarchiCAD find them both - all the libraries have to be in one place).
this is a workaround: the libraries will not update automatically as they do with archiCAD's in-build 'cache library' handling. you have to manually update these library copies if you have made changes to them.
HTH
~/archiben
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