Strange behavior after using NIK plug-ins

Question

Every once in a while I encounter this strange behavior of Aperture. I first process the NEF's in Aperture (white balance, Exposure, Enhance... and, when needed, Cropping) and then I fine tune the image with the NIK plug-ins; when needed DfIne 2.0, Viveza, Color Efex Pro 3.0 and Sharpener Pro 3.0 Output Sharpener.
If I look at the processed picture then, I get a perfect presentation of the photo;
!http://users.skynet.be/fc419085/Aperture-1.jpg!
But when I press Z to zoom into a 100% preview I get this;
!http://users.skynet.be/fc419085/Aperture-2.jpg!
When I select the Loup in the normal view mode I get this;
!http://users.skynet.be/fc419085/Aperture-3.jpg!
This doesn't happen with all my pictures, yesterday I processed a series of 8 pictures an 6 of them showed this behavior the other two acted normal and I can't see what I did differently whit these last two.
When I export the strangely behaving photo's to a Tiff or a Jpeg, I get perfectly normal pictures.
The original NEF behaves normal. I have seen this behavior with NEF's from a Nikon D200, D2x and a D300. I have Aperture 2.1.2 running on a 2.33 GHz Intel Core Duo MacBook Pro running Mac OS X 10.5.6
Does anybody know what's happening and if so, how to solve this problem?
Cheers,
Ivan

Answer 1

I did some testing and what I found is too weird to be true.
First this mashed up look doesn't only happen after using NIK plug-ins, it also happens when making a roundtrip to Photoshop, given that certain conditions are met.
Give it a try yourself. Crop an image to an uneven pixelcount dimension, for example 4227 x 2797 and make a roundtrip to Photoshop. Then have a 100% view look at the new image in Aperture. You'll have a mashed up view, at least I do.
Now crop the same original image to an even pixelcount dimension, for example 4228 x 2798 and make an roundtrip to Photoshop once more. When you have a 100% view of the new image now, you'll see a perfectly normal photo.
Do you think Aperture developers are reading this forum?