Bukkit

What steps will reproduce the problem?
1. Infecting oneself through /ww infect or getting bitten by a wild wolf
2. Setting the world time to night through /night (Essentials)

What is the expected output? What do you see instead?
Even though werewolves have a high natural defense, one cannot die. You take damage until you reach a certain amount, usually 9 whole hearts of health. Sometimes, they get fully regenerated. After that, you take damage again, but once you reach the certain amount of health again, you still won't drop below that health or get healed again instead. The same goes for any other player that is no werewolf, regardless if they are in hunting mode or not. There, the amount of health you stop taking damage is between half a heart and two whole hearts.

What version of the product are you using?
0.7.7 and 0.7.8 for Bukkit 1.8.6

Do you have an error log of what happened?
There is no error log.

Please provide any additional information below.
Installed Plugins:
-BedWars
-ChatFeelings V1.2
-ChatTroll V1.0
ChatWarn
-Citizens 2.0.16
-ColoredSigns
-CS-CoreLib V1.1.12
-Essentials V2 (and above)
-EzWarnings
-Global Market
-Hiders Vs. Seekers
-mcMMO
-Multiverse V2.4
-NoSwear
-Paintball V1.3.3
-PermissionsEx V1.23.3
-ScoreboardTimer
-TagMe
-TitleOnJoin
-Vault, of course
-WorldEdit and
-WorldGuard (both V6.1)
-YouTube Recorder

When I tested it, there was one alpha werewolf and one hunter, both being operators. We deactivated /god and eventually even deopped ourselves through the console. However, we didn't die.

However, I don't want to merely complain about this plugin.
It is a great plugin!  Even though I cannot die, I had a lot of fun beating up mobs during a full moon! =P