I am still attempting to determine what is happening. I think it might have something to do with mod_rewrite not returning the right value to the browser, but so far my trial and error changes to Apache2 have been unsuccessful.
My site is hosted on OSX 10.9.4 Server, so I have to be a bit careful with configuration changes due to Apple’s customization of Apache. If I make any progress, I’ll post it here. I’d really like to see this plugin in action. Looks like great stuff.