Digital BW, The Print

I have a 9600 on Mac OS X, and it appears I have to remove the QTR printer in Print center 
to avooid massage "command error" over on the printer with resulting inability to print. I'd 
of course like to alternate between the two without reinstalling/removing QTR. Am I 
missing something? Your help is very much appreciated. I am a newbie with QTR....