Rip,
I've been using an old HP 455CA with a the previous AC 9. See this thread;
http://archicad-talk.graphisoft.com/viewtopic.php?t=14695&highlight=
Sometimes failing to set the 'Location' prior to plotting gives the type of problems you seem to be having.
HTH
Mark
Mark R. Wallace AIA
---------------------------
Mark Wallace Architect
Collegeville, PA
Mac G5 Dual 2.3 Ghz, 1.5 Gb RAM, OS 10.4.9
ArchiCAD 10 Bld 1183
Mark R. Wallace AIA
---------------------------------------
MacBook 2.53 Ghz, Intel Core i5, 8 Gb,
Mac OSX (Sierra 10.12.6,
ArchiCAD 22 USA Full, +21, & 20.