Image Uploader not generating Thumbnails and showing Image URL

Check your uploads path in Settings->Media. It should be blank in most installs.

That’s not a screenshot of your uploads path.

Can you post a link to a publically accessible page that contains a link to one of these “missing” images?

Have you tried:

– deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).

– switching to the Twenty Eleven theme to rule out any theme-specific problems.

– resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.

– re-uploading all files & folders – except the wp-content folder – from a fresh download of WordPress.

Use another theme?

It’s impossible to say. You need someone to start going through the theme bit by bit.