P: JPEG file display corruption

Hi Doru, no need. The file you posted works to reproduce. The team is looking into it. Thanks.

Hi Jeffrey, I have been using Picasa for years. My entire photo collection has been imported and edited with it. I do basic editing like cropping, automatic exposure and white balance correction, and on occasion fill light and red-eye corrections. At the end I flatten the picture and remove the originals to save space.

The important part here is that until now I have not seen any images being rendered incorrectly with any other Mac or Windows program except LR. Over the years I shared the albums with friends who also use a variety of Apple and Windows computers and none reported any issues. I would suggest investigating the JPEG decoding algorithm implementation used by LR as this is so far a singularity. If needed I can provide a few more pics.

Hi Doru, it looks like the files have been modified in some way by Picassa. Are you using Picassa on you system? If so, what version? Are you making any specific changes?

Hi, I am running LR 5.3 on Mac OS 10.8.5. The images are located on the system drive in the ~/Pictures folder. The affected photos are coming from two folders storing photos I took and extracted from the camera at different times as well as a couple of 10 year old desktop backgrounds. After deleting the preview file I briefly saw the thumbnails being shown correctly and as the previews were generated these files getting back to the distorted image. Deleting the preferences and the previews folder again did not change things. The photo thumbnails were looking good for a glimpse of a second until the previews were generated.

Please note that every other program that can open JPEG files has no problem displaying them correctly.

What OS version? Where are your images located - are they on an external drive, or network drive? Is there a pattern to this occurring with images in a specific location?
This could be a problem with your preview file - it has the same name as your catalog, but ends in previews.lrdata, and is saved in the same location as your catalog. You can delete this file (catalog-name preview.lrdata), and then see if the images still have the same issue.
If that doesn't work, try resetting your preferences: http://helpx.adobe.com/lightroom/kb/r...
Have you opened and saved these images in other applications?