Digital BW, The Print

I am getting absolutely beautiful results using Roy's great QTR, but so 
far only on sheet paper with existing page sizes...

Has anyone figured out a way to get roll paper working on the 7600 
using Panther 10.3.4 and Gimp 4.2.5? When the printer is loaded with 
roll paper, set to either roll-auto-cut or roll-no-cut, and saying 
"ready" I send  a job to the printer, and the whole job spools and says 
"printing" but the printer just sits idle and "ready" and never does 
anything. I am choosing the roll option in the Gimp driver. Everything 
seems in order, but nothing happens. In sheet mode everything is fine. 
I have also tried all the other combinations: roll paper set at the 
printer but sheet set in the driver and the other way around as well... 
all with no success. I'd send a really nice bottle of wine to anyone 
who can help me fix this problem!