Ok, I posted this on the bug side but wanted to put it here just in case it needed a little discussion or someone could help me resolve it.
The site mod is supposed to use an outside website to go to the url once it's been entered and submit is clicked to create a thumbnail for the entry.
When you enter the URL and click submit, it takes you to the next page and no thumbnail is displayed.
If you hit the refresh button and reload the details page, the thumbnail image mysteriously appears at which time you can complete the page, click submit again and the site post with the thumbnail image is successful.
If you do NOT refresh the page and force the thumbnail image to appear, then the post is made without the image. You cannot go back and fix it or force the image to be created after the fact. The only recourse is to use the upload feature and place an image in the ad or just delete it and try again.
I know to hit the refresh button but my members do not and almost every site that is added does not successfully produce the thumbnail.