Thank you for your post.
Does the images tester itself say page not found?
Or the original image or the thumbnail image?
I look forward to your response.
Thank you for replying so quickly. The thumbnail image says page not found 404
Thank you for your response.
If the thumbnail image says 404 Not Found, it could be security. You should show the URL to your hosting provider so that they can tell you if Apache mod_security is blocking it.
Click the “Open Resized Image…” button like this: http://goo.gl/gr163l . That will open the image in a new tab, the full TimThumb image URL. Give that URL to the hosting provider, it looks something like this:
http://plugin.slideshow.wpplugins.biz/wp-content/plugins/slideshow-gallery/vendors/timthumb.php?src=wp-content/uploads/slideshow-gallery/ipad-image.png&w=100&h=100&q=100&a=c
I look forward to your response.