I am also having this problem, as the orientation of the Leap Motion cannot orient properly in the Character Blueprint. What happened since 4.8.1 the Leap Motion plugin has not worked properly.
To recreate the issue, place the Leap Motion controller in your character bp, and set it to HMD. Note the hands do not display in a proper location, or orientation.
I have resorted to using 4.8.1, until someone notices. Also, rebuilding with leap plugins does not seem to work.