QTR-Quadtone RIP

Hi,
all of a sudden, 100% blacks are printing lighter than 18% grey. The
rest of the tones are fine, however.

However, the Epson driver is fine.

Unfortunately it's a 2100, so I am reluctant to use the Epson driver
for BW ... and I have an exhibition to print.

I'm not sure where to start with problem - any pointers would be appreciated.

thanks,
Richard
-- 
www.richardsmallfield.com