I understand it works well as long as you don't edit the theme from within the GetSimple admin page.
Can you check that you have one .htaccess file in each sub-directory of the plugin?
Check also the content of the file (Allow from all).
I look at http://www.brightux.com/
There are also a lot of errors but not related to nanoslider:
Failed to load resource: the server responded with a status of 404 (Not Found) http://www.brightux.com/theme/twitter-bo....slider.js
Failed to load resource: the server responded with a status of 404 (Not Found) http://www.brightux.com/theme/twitter-bo...slider.css
Uncaught ReferenceError: jQuery is not defined jquery.parallax-1.1.3.js:69
Uncaught ReferenceError: jQuery is not defined jquery.localscroll-1.2.7-min.js:9
Uncaught ReferenceError: jQuery is not defined jquery.scrollTo-1.4.2-min.js:11
Failed to load resource: the server responded with a status of 404 (Not Found) http://www.brightux.com/theme/twitter-bo...er.pack.js
Uncaught ReferenceError: $ is not defined
Can you check that you have one .htaccess file in each sub-directory of the plugin?
Check also the content of the file (Allow from all).
I look at http://www.brightux.com/
There are also a lot of errors but not related to nanoslider:
Failed to load resource: the server responded with a status of 404 (Not Found) http://www.brightux.com/theme/twitter-bo....slider.js
Failed to load resource: the server responded with a status of 404 (Not Found) http://www.brightux.com/theme/twitter-bo...slider.css
Uncaught ReferenceError: jQuery is not defined jquery.parallax-1.1.3.js:69
Uncaught ReferenceError: jQuery is not defined jquery.localscroll-1.2.7-min.js:9
Uncaught ReferenceError: jQuery is not defined jquery.scrollTo-1.4.2-min.js:11
Failed to load resource: the server responded with a status of 404 (Not Found) http://www.brightux.com/theme/twitter-bo...er.pack.js
Uncaught ReferenceError: $ is not defined