The Passive skill for the Witch Doctor, "Jungle Fortitude" (http://us.battle.net/d3/en/class/witch-doctor/passive/jungle-fortitude) is not working (at least) for the Witch Doctor character (not verified for pets).
1.) Play Witch Doctor (level 60) on Inferno, ACT - I, any quest beyond "legacy of Cain" (for this test, Monster Level 5).
2.) Make sure "Jungle Fortitude" IS NOT set as a passive skill. Also, remove your follower and unsummon all pets.
3.) Go to "old Ruins" way point, if the zombie mobs are dense, restart the game and repeat #3.
4.) Look for just 1 zombie to test
5.) have the zombie attack you. Damage ticks at 7000 - 10,000 without Jungle Fortitude (on my Character).
6.) Go back to town (don't die) and heal.
7.) Switch on "Jungle Fortitude" as passive skill.
8.) have the zombie attack you. Damage ticks at almost the same at 7000k - 10,000 per hit with Jungle Fortitude On.
Additional Notes: Also, I don't know if it's just standard, but the damage reduction number does not increase on the visible stat details, but maybe it's just a hidden bonus stat.
Number of times Bug Reproduced: 5
Bug Type: Game Mechanic
Bug Category: Skills/Classes
Bug Severity: High