I recently updated my wordpress blog to 3.1.3. Unfortunately when I upgraded my blog a plugin I really need stopped working. I emailed the plugin author and he upgarded it to work with 3.1.3. However no matter what I do I can't get it to work on my old wordpress blog. I tested the updated plugin on a fresh wordpress install on a test domain and it worked perfectly.
Any ideas why I can't get it to work on my old blog?