I just really noticed this as a problem recently. I'm getting a light cast on the areas that should be white paper on the borders of my prints.
This is happening on a mac running 10.6.6 and CS5, happens in CS4 but not CS3, printing on a 3800. I did the relatively recent epson updates and even reinstalled
the driver but still happens in the two recent photoshops. It's not as prevalent on EEF but Canson papers and other 2nd and 3rd party papers display this more.
I've only found one post addressing this issue but no real solutions.