Hi,
I’ve had the same problem described by fatwombat and I could solve it as it says (deactivating and reactivating the plugin, thanks a lot for that comment!)
shawn: firstly I have to congrats you for the good work with the plugin, but I also think that you should releaase a hotfix for this situation since may be a lot of people are upgrading the plugin without noticing this error and finding this post.
Thanks a lot for your work guys!
Fixed with the 1.0.4a update.
Thanks a lot for your work, keep it up!