Weird structures in tonal transitions under ACR 4.1

Greetings,
I switched to ACR 4.1 recently and found that 4.1 (as opposed to, say, 4.0) creates weird microstructures in gradients and tonal transitions. They are clearly visible when image is oversharpened, but do affect the image even with proper sharpening.
Here is an example. Windows XP, Photoshop CS3, Canon 20D, ISO 1600. The image has been converted with noise reduction luminance=50, color=50. With ACR 4.0 the sharpening was set to 100 (yes, I know, that's not the proper setting) and with ACR 4.1 Amount=100, Radius=1.0, Detail=25, Masking=0.
This is ACR 4.1 conversion: http://www.kaax.org/pile/Microstruct/20050430_0168_microstruct_ACR41.jpg
And this is ACR 4.0 conversion:
http://www.kaax.org/pile/Microstruct/20050430_0168_microstruct_ACR40.jpg
These are 100% crops of a small part of the original image and show an out-of-focus edge of a dark object against a light background. Raw file is available upon request.
My impression is that overall the ACR 4.1 does a better job of dealing with high-ISO images -- the conversion is cleaner and smoother. But -- and this is a big BUT -- the tonal transitions areas suffer from this microstructure that ACR 4.1 introduces.
With many images this is not a big deal -- if you downrez a full frame for screen display or, say, print a 5x7, the microstructure disappears or fades below the perception threshold. But for some images -- in particular, ones that are printed large or heavily cropped and then oversharpened by design -- for such images this problem makes ACR 4.1 effectively unusable.
I would appreciate comments as to whether this microstructure is here to stay with future releases of ACR or it's an early-implementation artifact and will be fixed soon.
Kaa

Jeff, post #13> You cant' mean it!! Prints, prints, only prints, always full frame, 300dpi, 1200 dpi, no crops, no enlarging....
Where do you live? Photoshop family is sold for these purposes only? Please visit the real world, reality is so much different...
As I wrote in another forum:
I work as an art director/designer and in my workflow it is not an exception to use 100% crops for on-screen art, small part of images for prints or, on the other hand, mere 30 dpi images for large media. As a matter of fact, this is very common. Many shots are presented on screen at 100% too. I'm perfectly aware these differences wouldn't show in a 300dpi print, but unfortunately 300dpi prints of full frame images are about 20% of my output.
Every pixel counts. Even though Kaa didn't mention loss of detail, I have to... I made this simple test: I made ACR 4.0 conversion of iso 100 image, scaled it to 70% then back up to 100% and applied basic sharpening filter. Then I compared it against 4.1 conversion (layer over layer). Even then the twice resampled 4.0 was better and I would choose it right away (against the fullres 4.1). Of course it depends on individual image, but new algorithm's splotches are killing many megapixels of my camera's resolution. And I can't turn it off.
There ARE losses in detail, there ARE nasty structures (in natural textures and bokeh especially) and it IS an issue in real world situations.
Concerning the noise (which is probably the origin of all those new changes): If the noise is captured, it should be converted. If one wants, one will remove it after that in proper tab. Remember, Adobe products are Pro products. In future CS4, will we have healing clone tool only? It is so much more sophisticated then the old Clone stamp, isn't it? Will there be default noise reduction when saving psd? Or what?
Stop talking about prints only and not being important what you see at 100%, please.
4.0 quality with 4.1 functionality would be great. Adobe, don't fix what isn't broken. Thank you
Ivosh

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