In slidorion_uploader.js this plugin uses the same name as a function in wp-admin/js/media-upload.js (specifically send_to_editor).
This causes issues when WordPress calls send_to_editor - this plugin's version is called instead of WordPress's.
This is particularly an issue when using the "Media Library" tab in the "Add Media" dialogue (the one that you use when creating a post/page/etc). When you press the "Insert into Post" button, nothing visibly happens.
I made a quick change to the function definition in the plugin - and I doubt this is the 'proper' way to resolve this issue: http://pastebin.com/ngg0b0Dm
This checks if the current page is the 'new sliderion' page, and if it is, we use the code from the plugin, otherwise we use the code from media-upload.js. This will only work for this specific domain (I was too lazy to make it work in general because it's probably not the right way to resolve the issue anyway).
This plugin is overriding WordPress's core functionality, so I think this is a pretty serious issue and needs to be resolved properly.