Oh well, it was a grasp in the dark. Where do you think the problem is? Some people claim to not have a problem with printing. I don't know if they are printing from Photoshop or Lightroom or any other details though. Printing black text works wonderfully.
Someone, (I'm sorry I forget who now, and can't go back and look while preparing a post) said they deleted the color sync or color sync utility and fixed the greenish print trouble. I guess it can't hurt to try that.
I am able to print in iPhoto, using Colorsync and get beautiful prints, though maybe not quite as good as a good working Photoshop managed workflow. I can print in CS4 using Colorsync and it's so/so (a slight bit dull and lifeless), but printing from Lightroom doesn't work at all. Major greenish cast and very dark, just like if I try to print from CS4 with a North American Prepress type workflow and Photoshop managing color. Using Epson's "Color Controls" is sort of OK, except the whole bottom of the dialog where adjustments can be made don't show. Part of one slider does, but the rest is totally missing. So to sum up, Colorsync seems to work as well as always, and everything else doesn't. So what is the root of the problem? I don't suspect Adobe stuff, since it worked fine in 10.5, though that doesn't mean it's not the problem in 10.6. Since ColorSync seems to do OK I would tend to think it's either an Epson driver problem or a Colorsync problem.
I guess the best thing to do right now (though I go nuts when things don't work right) is to be patient and wait for Apple, Epson or Adobe to do something. And get prints from Costco if I need them that bad. LOL