Cannot add Minimum Proficiency Level in Redwood Job Profile Competencies

Since turning on Redwood, we cannot add the Minimum Proficiency Level of a competency in a new Redwood Job Profile. The drop-down is blank:

However, for existing job profiles, the proficiency level is visible (but not editable - we get a blank drop-down like the example above):

Is this a bug? Any ideas on how to fix this?