SOLUTION1:try to touch the clock via the white rectangle clock view.
(the clock app will open) and save the alarm from there. works for me in galaxy s5 sm-g900f
SOLUTION2:
the real solution that will not force you to open the clock app is to set your default Alarm tone using ES File Explorer...
Great !!
I spent almost half of a whole day to find the solution for 'Handsfree auto answer app' stop working with lollipop. with about a 100 failed apps and self development tries thanks again
thank you very much -George Collins1- for the answer!!!