Hi,
There has been a strange phenomenon of some mysterious libraries appearing for no evident reason into many projects for some time now. Today I decided to investigate this.
I'm so glad I stumbled into this thread. I'm seeing the behavior Laura described in my office. Steps to reproduce include having an "infected" file and pasting a simple 2d-line in plan view into a clean file. (AC19 FIN)
Seems to work across versions, too, so that copying from AC19 "infected" into AC20 clean also infects the clean file.
Has this issue progressed in any way towards a solution?
EDIT: While playing with this, I also noticed something even more weird; In the infected file, if the element I copy has a renovation status which is not visible on the target (clean) file, pasting into the clean file produces a notification along the lines of "cannot paste element that isn't visible in current renovation view". OK, all fine. The weird problem is that 1)while nothing gets pasted, the failed paste-operation still brings the mystery libraries into the clean file, and 2)the imported mystery libraries cannot be removed from the project. At all. Removing them in the library manager seems to work normally, but the next time the library manager is opened the libraries are again there.