Images with black blotches showing up.

I have a wierd problem with picture quality that just started showing up.
The black detail in certain areas of the picture is becoming overly black. Blotchy black areas especially on the screen and in prints. Black detail becoming overly compressed. The gradation between light and dark on my 23 HD and 17 Cinema display shows as layers of black, not a continual gradation to black. To explain it another way, the gradation of black colors (when going from light to dark to black) appears on the screen almost like Newton's Rings. I'm starting to get blotches of black in the darker areas of my monitor images and now on the prints. All the pictures are RAW (shot in Adobe 1998) from a Nikon D70s. None of the images have been altered in any way. No color correction, exposure increase or decrease, nothing. Straight RAW files imported directly into Aperture from the camera. I have printed all these pictures before and they looked fine. Now they have these black blotches in them. Not all pictures have the problem but the ones that have the darker black gradations (primarily to deep black).
I have a custom .ICC profile I use for printing and the monitor was calibrated too, using ColorVision tools. Spider2Pro and PrintFix Pro. But even is I use the standard profiles for the monitor and the printer, it's still the same.
The wired thing is, if I open the image with an external editor, Photoshop CS2, I do NOT get the same problems on the screen as I do with Aperture. (I have not printed yet from Photoshop CS 2 since this started, only viewed.)
This is just a recent problem, and as I said, I have been printing the same pictures before and viewed the same pictures before with no problems. I noticed this starting to happen after the last 2 updates for Aperture, and it has progressively gotten worse.
Any picture that has a continual gradation from a light black to dark black to full black has this problem. (On a 9 zone gray scale - say zone 5 thru 9)
Equipment Notes: Aperture 1.1.2, Mac OS 10.4.7, Apple 23 HD display, Apple 17 Cinema Display, Dual 2 GHZ PowerPC G5, 3.5 GB RAM, 2 SATA internal Hard Drives, (the one with Aperture has 30 GB's left on it and the other that I use as Vault Back-Up has 164 GB's available. Video Card - ATI Radeon 9600 Pro, AGP bus, 64 MB RAM
Epson Printer - R2400, using K3 inks on Premium PhotoLuster paper.
Does anyone else have this problem? Do you know how I send this problem to the Aperture Team?
P.S.
I too have notice a tremendous slow down in Aperture as of late as other people have stated.
I too sometimes don't get a image in the viewer. I sometimes only get the Right half of an image in the view. I can get other pictures to the left and to the right of the image in question but Aperture sometimes just picks a picture to only give me half. I must shut down and re-open Aperture to get the complete picture on the screen again. I can't figure that one out.
Thanks,
Jim

Well, besides my 2 previous posts, I would like to add something. I started printing and everything was going well once I turned On Screen Proofing off.
Oh, I guess I must first point out that I have calibrated my Monitor and Printer, using ColorVision's Spyder2Pro for the monitor and their PrintFIX Pro for the printer. It looks pretty good. But here is the problem.
As I started to say, after I turned off On Screen Proofing everything looked good, on my screen and my prints. I started to print using my Colorvision settings and my custom ColorVison printer profile. It worked for a while on some prints but I ran a print with a long gradation of black to deep black and that replicated my original problem. Blotchiness and striations of black. I found that if I printed with Epsons' ICC profile it was fine. So the ColorVision profile didn't work on some prints with deep gradations of blacks.
So I called their tech support. They asked if I did their 225patch target or the more extensive 700 patch target (I'm not sure of the correct number of patches). I had done the shorter 225.
They told me this is a common problem if you only do the 225 Patch Target and that I would have to do the 700 Patch Target to not get black patches/striations in my prints. As a note: the striations looked exactly like the On Screen Proofing problem when it was turned on.
So as it turns out, I had 2 problems at the same time.
I haven't done the 700 patch test yet. I'll let you know when I get it done, how it works out and if the On Screen Proofing matches the print as suggested by firstlaunch.
thanks for all your help and suggestions!

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