[Plugin: Mobile theme switch] Plugin is not working anymore after upgrading wordpress to the latest

Hi
I am using this great plugin in many websites
and just noticed that the after upgrading wordpress
to the latest version 3.4 the plugin is not working anymore,
the plugin doesn’t recognize the theme I want to use for mobile
can you check?

Thanks

https://www.ads-software.com/extend/plugins/mobile-theme-switcher/