There has been no changes to the site, the only thing we have done is add plugins and change words in the language files.
I would really like this to work, one thing that you mentioned is a let down, we only want to be able to switch between two themes, and from you telling me that the "origin" theme has to be installed, this is a theme we would not use as a selection. it a good theme but we would have to completely change the css and images to get what we are looking for and that is something we are not comfortable doing.
Is there a way to make the plugin to where you could select which themes are available to the members for selecting... this would be a great option for the plugin.
I hope you can figure out what is causing this - this plugin seems to be a great idea and would love it work on our site, the only thing I can think of is there is another plugin that is conflicting with Theme Changer plugin..
If you login to the FTP - you can see all the plugins we have.