Epic plugging have a little bug in Maya 2015 in the window “Edit Character”:
I fixed this very little problem for my fellow 3D artists.
The fix:
You only need to overwrite the files in: …/Maya_AnimationRiggingTools\MayaTools\General\Scripts\
For programmers:
The fix only changes the height of thextScroollList for 300 to 200 and compile in phyton 2.7.