I have run across this in only one situation, it had to do with the dimensions of the image. On my site I have to have the maximum dimension in either height or width less than 1024. When I had run across this, if I added the picture I would get a page not found response in admin. If the image appeared on the main page, I would receive the same. If the image was not on either of those, then things would work, but as soon as I selected an option that was to display the image, then it would fail out again and I would have to back up to a previously functional screen.
Ultimately I think I had to go into mySQLadmin and remove the picture reference so that things would function again. Then I downsized the picture(s) and uploaded again without issue.



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