I think this is similar to what I am experiencing.
The plug in does not let me save any new buttons (although it does respond to clicking on the ‘save’ button).
I de-activated and re-activated the plug in but no success in retrieving any buttons (on the off chance that they were created but couldn’t be retrieved to show in the list).
Looks like they have, wasn’t a problem before, but possibly now that I have upgraded to 3.5.x it could be.
