Everything looks good there. There is clearly something different in your setup than every other user of this plugin.
What versions of WordPress and each plugin are you using?
Do you have any PHP object cache setup?
Do you have any web cache setup?
What type of webhost are you using/testing this on? Some of the cheaper shared hosting plans force caching on the users.
If there is a bug keeping the plugin from working on your setup I am happy to fix it, but I can not reproduce your problem in the various configurations I have tried.