2. In the Config panel, make sure Base URL is set (you may as well set Data URL while you're there, if you haven't already.)
3. Make sure Image Link, Thumb Link, and Short Link all contain the full path ("http://" and onward,) either by using $base or plain text. Link to Image will not be able to retrieve the correct paths without these variables.
4. If you use .htaccess to make NiceURLs, make sure that a it allows access to the /ext/ folder, or else Link to Image will not be able to access ext/link_image/style.css.
* Renamed link_image.ext.php to main.php and moved to /link_image/
* Created style.css { /* 404'd :|*/ }
* Documentation (different from mine.)
* Changed add_text_option() and added add_label() in SetupBuildingEvent because I was using an edited version of the function that shish didn't know about. It was a wonder that didn't throw massive errors.
* Fixed HTML thumbnail link code. (image tag was being html_escaped twice, resulting in "$gt;" and "<" from the first escape becoming "&gt;" and "&lt;") It turns out that html_escape was completely unnecessary, all I had to do was replace the single-quotes around the attributes with escaped double-quotes ('\"'.)