JabRef version 3.6 on Mac OSX 10.11.6

Steps to reproduce:

1. Install JabRef 3.6 in a different location than JabRef 3.5.

The Preferences -> BibTeX key generator preferences appear lost.

1. Import preferences -> browse to preferences location.
2. Select file format: "All Files" and the format does NOT change (it remains XML file).

Renaming my preferences file from jabref.prefs to jabref.prefs.xml allows it to be selected/imported and I am told to restart JabRef for changes to take effect. When I restart, the BibTeX key generator preferences have not been changed.