Mamia,
Check to see if the setting "Print Colors as Black" is set in the print dialog. In A10 (and R10) and prior - any color ink (even a nice, light, pale, buttercup yellow) would print solid black. Not what most folks were looking for.
In A11 & R11, they changes this to "Print in Grayscale (Black & White)" ... which is what folks were looking for.
Yea, took them 10 versions to correct it... strange thing is that no one complained about the prior setting previously. But when they mentioned it... man, everyone clamored on as this being a major problem..
Take a look. Give it a shot. See what happens.
Hope this helps.
Thanks.