Digital BW, The Print

Help!!!
This is driving me mad. I have installed Roys QTR on a Mac running 
OSX 10.3.4 connected via USB to Epson 2100. Software loaded and 
curves installed. All looks good. However when I try to print I get 
nothing!! Printing dialogue gives 'Starting Job' then 'Printing page 
1, 0%' then after a few minutes file disappears with 'No Job 
Printing'. Sometimes the print dialogue says 'Sending print file' and 
then nothing. Printer works fine with Epson driver.

Any ideas.

Peter