Note this issue is mentioned in on the plugin’s Support page on your site in the Troubleshooting Tips tab. Users may not realize that renaming a folder would break links to files that are embedded in post and pages. The proper way to rename a folder is to create a new folder with the new name and move the files to the new folder. During the move process, links embedded in standard WordPress posts and pages will be updated. We do encourage new users to do a test move before moving lots of images in case their theme stores embedded links in a non standard format.
