Nick,
FYI.
check out a thread a had going on....
http://archicad-talk.graphisoft.com/viewtopic.php?t=50295
it resolved the issue of the "end conditions" with renovation filter on "NEW" and "EXISTING" walls creating that line in between them.
it can indeed be done. just need to tweak the reno filter a bit but check out the thread. Just for future ref in case anyone else has the same issue about how to make walls of different renovation conditions show the line between them.
...Bobby Hollywood live from...
i>u
Edgewater, FL!
SOFTWARE VERSION:
Archicad 22, Archicad 23
Windows7 -OS, MAC Maverick OS