Okay, got it back working again. As a quick fix you can replace the ui.py file in the .2.79scriptsaddonscycles path of your Bforartists installation by the one in the zipfile attached here.
Note that three props are missing now in the Light Paths panel, compared to the Blender 2.7.9 release. But i compare my code with the Blender master. And here those three props are gone. See image.
A new version may need a few more days. I will first go through the UI again, compare it with the Blender UI, and check if something else is broken. We had already two regressions too much that made it through.
Kind regards
Reiner