I am using theme 2011. I activated the plug-in and I had the same issue as above. I have the most current update of wordpress installed.
I also have Lightbox, NexGen and Zemanta activated.
I get these error messages:
Warning: Unknown: open(/var/chroot/home/content/56/2056956/tmp/sess_cas2002v4fbsc8hpsnqd9f3n86, O_RDWR) failed: No such file or directory (2) in Unknown on line 0
Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct () in Unknown on line 0
Please help, I love the idea of your plug-in and would love to be able to use it appropriately!