Lightroom 4.1 exported JPEG files are not recognized by Apple Preview App

I just started using Lightroom 4.1 Trial version (coming from Aperture). I exported JPEG versions of some images using an ICC profile. On my iMac running Lion 10.7.5 the pictures do not show a thumbnail, the file on the desktop just shows "JPEG". I could not open the file with the Preview App, but I am able to open it with DPP (Canon software)? Also the file shows that it has 0 x 0 dimentions when I click Get Info even though it is about 25 Megs in size?
The message I get is
"The file “Edit-739820120223Canon EOS 7D.jpg” could not be opened.
It may be damaged or use a file format that Preview doesn’t recognize."
Does anyone know why this is hapening?
Is it a know issue between Adobe and Apple?
Is there a fix for this?
Thanks for help in advance.

25MB is quite a large filesize for a JPG, and this might be either quite a lot of pixels saved at a very "high" quality (not very much compressed), or it may be an extremely large number of pixels saved with medium compression.
While the technical spec of the JPG format imposes an absolute limit on maximum width and height pixel dimensions, some software employs a lower limit above which it considers the file to be invalid. Different programs, different limits, sometimes.
I have encountered this (for example) with pano stitched images using the full resolution of a large number of component shots - where JPG output could not be made, or if made, could not even be viewed as a whole by my standard image viewer (though TIFF was still OK even at still larger sizes).
If Lightroom has been set to a large printed size AND to a high ppi resolution, it is easy to get into very high numbers and very large output files. One should IMO at least question the utility and benefit of using very high ratios of upsampling from a standard digital photo - which may happen in some cases as a result of using the same output settings regardless, when spreading the same data across both small and large scales. If the file that was imported into LR really does provide an unusually high number of pixels expressing lots of detail, then that will better deserve such a capacious output file. Otherwise, each part of the file may merely show a very highly detailed representation, of a very blurry nothing-much-in-particular.
If the JPG has exceeded the viewer's size limits, a reported width and height of 0 may represent an error message, in effect - not actual reality.
regards, RP

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