Just got an Epson 3880 printer. When controlling with photoshop (cs5, Windows 7, 64 bit), print preview is extremely magenta. Previewing to an Epson R220 is fine, as is previewing to the 3880 from MSWord. Tried myriad settings with little variations in results; all were poor. Using printer managing did give credible results.
check the colour settings, maybe they got changed.
edit > color settings
what is it set to? north american general purpose?
the second thing to look at is what printer profile are you using?