Hint: For improved responsiveness, use Internet Explorer
4 (or above) with Javascript enabled, choose 'Dynamic' from
the View dropdown and hit 'Set Options' to save your changes.
I'm having the same issue, uploaded everything and it looks as if it's working however when I click the "Add files" button it just does nothing. I'm using the HTML5 version as well. It's not file permissions, they are set correctly. Please help.