Are you sure that the files are all properly working and there is nothing missing?
Maybe you should try re-downloading the files but from somewhere else and see if that fixes your problem.
Also i read on another forum...

Minify javascript?You can minify javascript and CSS to reduce the number of HTTP requests to the server, support proper browser caching, and compress the contents sent.
Was by default on Yes, set it to no and see if that helps.