2016-07-20 by richard@...
Even with the update to the new version of QTR and El Cap I've needed to go into the library/printers/qtrquadtone folder and then into the Quad7000, hit command+i to get info and change the permissions (you will probably have to click the little lock on the bottom right of the get info window, enter your admin password and change the permissions to read and write for. It been a while since I had to do this, but I think I needed to change the quadtone and each of the quadxxxx printer folders I was trying to write to.
Here is an Apple support page about how to do this:
Hope that helps,
Richard Boutwell
http://www.richardboutwell.com/