Digital BW, The Print

Antonis or anyone,

Has anyone had a sudden problem printing solid black areas with OPM 
1.02 on a Mac? Yesterday I did a print with large solid black areas 
and it printed fine. The next print had weird white gaps running in 
the printhead direction (almost like the heads were dragging against 
the paper). Did a nozzle check - fine. Cleaned the print heads, just 
in case - fine. Printed the file from Photoshop - fine. But print the 
file from OPM and the gaps/streaks appear. But only in the 100% black 
area. I haven't changed the black cartridge recently - maybe I should 
try that. I also tried reinstalling the software, and I've tried 
different profiles, but still the streaks. Any ideas??

Diana
(who's TRYING to make some Jerry Olson memorial prints, but not succeeding...)