If you are searching based on the image URL, it's possible the default name of the image was changed. For example, if you upload an image with image name Sphere, the image URL may end in sphere.jpg. Though, if you changed the image name to Kintera, you will need to search for the word Kintera in order to produce results.

If you don't remember the image name, you can try to locate it by the date uploaded via:
  1. From the CMS module, navigate to the Home tab
  2. Select the Search/Locate subtab
  3. Search over Images Create Date equal/before/after