Sad to head that your site has had problems while installing this plugin. Have you managed to get it back to work? This plugin does not use any database, so deactivating this plugin is like it’s never been installed before. Maybe there are some conflicts with other active (caching?) plugins.
And additionally let me note that this plugin should be used carefully for very few and small scripts. Otherwise it can affect performance.
Maybe you can give our new successor plugin a try? It’s rebuild from scratch and maybe works better for you: Embed JavaScript File Content