Digital BW, The Print

I think you are getting no suggestions regarding these problems 
because they don't make any sense. The PC has more restriction of file 
naming that the Mac, certainly more than 8 characters can be handled, 
and no extensions are required.
Also, workflows worked out on one should work on the other. I suspect 
it has more to do with Photoshop and Epson driver settings.
I could certainly be wrong, but that's my experience.
T