I installed the plugin on Theme -->

I installed the plugin on Theme --> http://ultimatumtheme.com/
(*) I insert the plugin in the header as a widget.
(*) I insert a widget on each Theme that i create ( to now 4)
(*) The theme are child-theme of Ultimatum
(*) Are the theme are visible in the dropdown list but if i make my selection the new theme in not working fine.
(*) to now all my test are on local machine, but if you need i can transfer all online.

please let me know how to proceed.

regards
marco