AirPort wi-fi seemed to be a problem for one user on a G5, he switched to a CAT-5 (Ethernet) cable and all was well, multiple sheets plotted instead of just one.
http://tr.graphisoftus.com/
Jeffry Covarrubias
GS US Technical Support Team Leader
P-C2D 1.86GHz/2GB w/ 256MB GeForce 8600GTS; G4 OS 10.4.10 1GHz/1GB "[that other software] is a fancy set of electronic marker pens"