Printing too Dark

It may be since Aperture 2.0, but possibly since installing Leopard (and even with 1.5), I can't get my monitor brightness and print brightness to match. I have been using an Eye-One Photo to calibrate my monitor (30" ACD) and my printer (Epson R1800). Before Leopard, this worked quite well. Now not at all.

I try to adjust brightness on the monitor according to the spectrophotometer and the Eye-One Match software, but the prints come out way dark. I even lower the monitor's brightness to the minimum, and my prints are still way too dark. This all worked fine with Tiger.

Can anyone suggest where I can look to address this problem?

Thanks!

- David