I have iPrint setup, installed, and running correctly with 150 Printers on Netware 6.5

We have recently added some new Richo Printers (Aficio MP C2550) which do work fine with iPrint and print perfectly.

However if I change these new printers to be iPrint Direct ones, the users can not print to them. They get an error saying "unable to print, do you want to troubleshoot".

If I change older printers to iPrint Direct Printing these work fine.

I have tried using RAW instead of LPR and putting NOSMNP in the printer load string, and installing the latest iPrint client, but no joy.

Any advice will be welcome :)