Digital BW, The Print

Greetings to all in this group,
I am certain the answers I seek are in this forum somewhere, but I 
haven't located them yet. Hopefully the brain trust here can point me 
in the right direction.
Just beginning to do a bit of BW printing on the inkjet, using a 
Canon i950, and I am getting a slightly magenta cast to the prints 
which come from scanned BW film. Doesn't happen with images shot on 
my digital cameras. I have made good BW prints from color-converted 
images from my Olympus C5050 zoom, and also from shooting in BW mode 
with my Leica Digilux 2. But when I scan BW negs, the prints have a 
slight cast to them, seemingly worse the "glossier" paper that I use. 
Needless to say, the images on the monitor have no color cast at all 
to them. I scan in BW mode using an Epson 1670 at 3200 dpi, print 
from a TIFF image in grayscale on the i950, and only use Canon paper. 
Also-- the digi BW shots, doesn't seem to matter whether I print in 
RGB or grayscale, those prints have good BW quality. Why the problem 
with the scanned negatives?
I would greatly appreciate any advice.
Regards,
Randal Dean