Very weird issue. I am using Maya 2015. When on the first step of the Character Rig Creator, nothing happens when I click the buttons for Leaf Joint or Jiggle Joint. However, the Dynamic Chain button works just fine.
I even tried using a fresh copy of the MayaTools folder, to effectively reset the entire plugin. I tried one from an older version of the engine (the version that I was using when everything used to work), and from the newest version. Same thing; click the button, nothing.
As a disclaimer, I am quite proficient with the plugin and have successfully created fully functioning skeletons and handles, with custom joints added. Seems like a pretty random problem. Has anyone else experienced this and figured it out?
We are still testing with Maya 2015 as Epic has just officially started getting versions of the 2015 Autodesk programs in a limited supply. That being said, has there been any updates to Maya 2015 recently? There might have been something in an Autodesk update which would change the behavior of the plugin. We will continue to investigate this issue, but can you also post a description in the ART official forum thread, Animation and Rigging Tools: FAQ, Known Issues and Feature Roadmap - Character & Animation - Unreal Engine Forums.