I use QTR infrequently but have had no trouble up until now. I print no problem from my epson 3880 driver using an ethernet connection, printing from iMac (OS 10.12.6) in PS. I have double checked my settings, however hitting print brings up the printer icon in the tool bar but does not print. I have tried re-installing QTR.
I select the QTR driver (QUAD 3880). Printer Manages Colors. Bring up the Print Setting Box and set this up according to directions in The Fine Art of Printing.
I am obviously doing something wrong but cannot put my finger on it.
Cheers Peter