Star ~ # ufed Use of uninitialized value in split at /usr/sbin/ufed line 187. Adding even a PORTDIR_OVERLAY="" into make.conf is enough to make that warning go away. Even though the actual issue here is quite trivial, having been burned before by ignoring a ufed startup warning (missing file in cascading profile that wiped all my use flags), I do pay attention to these warnings now...
Thanks for the report, fixed with 0.37-r1.