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System said:
Konda, assuming you mean a thumbnail is not displaying in your operating system's explorer, that would be an issue with it failing to generate its own thumbnails for some reason.

If you definitely downloaded the original image successfully to your computer and this is happening, it would most likely be an issue with your operating system and the original image.

Perhaps you could provide some examples and further details if it is still an issue?

Here's an example of an "afflicted" pic.
http://chan.sankakucomplex.com/post/show/3377038

The file has no thumbnail when I drag and drop it to my folder. When I right click save as, still no thumbnail. Thus, which method I use to save the file does not seem to matter.

Note that, in this instance (in case it is not 100 percent of instances), it's only the preview image (preview397197de45b5a70d32d943d1fcf4d0f8.jpg) that fails to produce a thumbnail, whereas the original file (397197de45b5a70d32d943d1fcf4d0f8.jpg) produces a thumbnail.