• Added: Config options to cause bloodmoons every nth night or whenever there is a full moon
• Added: Optional whitelist to control which monsters are spawned by a bloodmoon
• Fixed: Bloodmoon causing no monster spawning
• Fixed: Ingame config menu not showing the general category

You should delete your config file and let it be re-created because some options got moved around. 

There's also a new command (/bloodmoon entitynames) that lists the names of all monster entities within 20 blocks for the whitelist feature.

The different causes for bloodmoons can be combined.