Color problem on some jpg images

Suddenly it happens that some jpg images look almost black (very high level of contrast). I use a Samsung SyncMaster 245B monitor and I had never this effect before. I uninstalled Photoshop Elements and reinstalled, but the problem remains.
Other jpg pictures look normal, but I am unable to understand any difference in the original files.
The same bad pictures look fine if I open them with PaintShop Pro, this could bring me to consider a bad setup of Photoshop Elements ... but which one ?
Can you help me in finding a solution ?
Thanks

I agree with your comment. But what I don't understand is:
1) The monitor was calibrated and no changes done. The problem don't was present days ago.
2) Why only some jpg show this problem, while others generally are shown OK. I may add only that the bad ones are larger in pixels.
Thanks for your answer.

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Good idea, but I checked it... I mentioned reading right from the card in order to illustrate that the JPG files are "unsupported image format" even *right from the camera*. *In fact* the CF is not the differentiating factor between renderable and non-renderable. The real factor is whether the files went thru iView Media Pro or not. Files that were drag-dropped from the CF into a folder are not renderable by Aperture and files that were imported first (from the CF or from another folder) thru IVMP into a folder are renderable.
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http://fire.red7.com/aperture-tests/DSC_0070-good.JPG
http://fire.red7.com/aperture-tests/DSC_0070-bad.JPG
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import java.awt.image.RenderedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import javax.media.jai.JAI;
import javax.media.jai.PlanarImage;
import com.sun.media.jai.codec.ByteArraySeekableStream;
public class Test {
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//          bad image
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                    try {
                         ByteArraySeekableStream seekableStream = new ByteArraySeekableStream(data);
                         PlanarImage src = JAI.create("Stream", seekableStream);
                         byte[] data2=getByteArray(src);
                         return data2;
                    } catch (IOException e) {
                         System.out.println(e);
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}thanks
Edited by: hikarus on Mar 31, 2009 12:52 PM
Edited by: hikarus on Mar 31, 2009 12:57 PM

the problem is if you use this with the bad image
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