what is the embedded profile in your source image (ProPhoto RGB by chance?)
what happens if you CONVERT to sRGB and then print with the same print settings
be sure you use "No Color Adjustment" with "Photoshop Manages Colors":
if that isn't it, Googling "DOWNLOAD PDI TEST IMAGE" for a copy of the PDI Test Image for your test image, and posting screen shots of your Photoshop print settings, and OS "Print Settings" and "Printer Color Management" settings will likely help anyone help you faster...
No the embedded profile I was using was sRGB and the option to turn off colour adjustment is no longer there in CS5 when you select PS Manages Colors. It used to be in older versions of PS. Also I have a Canon and the driver options are slightly different to an Epson.
The Printer Profile I used was what I had obtained when I created a printer paper profile using Colormunki Photo. I also used Colormunki to calibrate the screen.
Okay, my bad, I don't print out of CS5 or 10.6 or Canon (I still send my printing over to a 10.4-CS4-Epson).
Have you tried printing using the matched OEM Canon paper and Canon profile?
Yes I've used Canon's own profiles to match their paper but obtain similar results. One thing that is different in CS5 is that you can't turn off colour management when you set up profiling process as is recommneded by Colormunki. I've currently got a customer support question regards this out with X-Rite who make Colormunki Photo.