Why do images have noise/distortion in Aperture 3?

I am having disturbing issues with Aperture (3.1 and 3.24) Lately, I am finding multiple images in my libraries that are distorted–they either have bands of gray noise on them, or, seem to have overlapping bits from other images or large balck sections. Requesting a New version from master brings in the same issue. If I try to export, sometimes I get nothing but black, sometimes the image retains the distortion. (I have posted a couple of examples on flickr to show what I am talking about.. . (http://www.flickr.com/photos/njwight/8114245495/in/photostream http://www.flickr.com/photos/njwight/8114225733/in/photostream )
Additionally, I have had messages when starting Aperture about " inconsistencies in the database and to repair it. " (I have had this a few times and I run as requested.) If I run a rebuild or repair (without the message) it runs fine and does not seem to find issues.
I have more than one library and this has happened in more than one, so it is not isolated. It has also happened on both my MacBook pro and iMac. The MBP is upgraded to Moutain Lion but I have hesitated with the imac as I would prefer to know what is causing thi before I upgrade teh second computer. It did start before the upgrade however.
If anyone has any ideas, I am all ears!
Thanks
NJ

Were these images originally fine or is this the first time you have looked at them?
Is it a few specific images that show the problems (and they show them every time), or is it hit or miss?
Because what you're seeing is not noise or distortion. It looks like file corruption to me. The thing is, Aperture never touches your master files. So the most common cause of what you're seeing is a corrupt card reader, or corrupt cable or something when you import the files. If you're 100% positive the files were once good, and have since been corrupted, it's worth exporting the masters out of Aperture and looking at them in Finder or via another non-Apple program that can read them (i.e. Adobe Bridge).
You say it happens on more than one computer. Is it the same images have problems on both machines? Because the 2nd most likely cause of this is a bad video card or bad video drive. But if you're seeing it on > 1 machine that sorta puts that one out.
It's worth investigating what you're using to import the photos in the first place, though, because corruption at import due to card reader or cable is way more frequently reported than I'd have expected. And, hopefully you *never* import directly from the camera. That's fraught with peril :-)

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