Custom Fields Disappear from CustomPress Admin

Hoping this is just a bug related to the most recent updates, but when I add a custom field to the CustomPress backend, any existing custom fields in the plugin settings pane disappear.

I have about a dozen custom fields (all created with this plugin), and when I added a new one today, they all disappeared from the back-end. The values are still getting written out in my site (or the caching is holding on -- I don't want to purge the cache for fear of losing front-end data).

Each time I add a new field, the previous one(s) disappear.

Help!