Creatures do not respawn

Playing OpenMW 0.35.1 and found that, if you dispose of the bodies of creatures you've killed they no longer respawn within 24 hours (game time) as before - I've left it four days and they still do not respawn. Downloaded and installed the latest build today and tested and the same happens. Tried several different character types but always the same. No Mods are being used. Platform: Win8.1 64bit.

(RM-2467 from redmine: created on 2015-03-25 by James Gaite, , closed on 2016-02-28 by scrawl ., relates #2363 (closed), duplicates #2928 (closed))