Bukkit

What steps will reproduce the problem?
1. Using http://dev.bukkit.org/server-mods/multiverse-core/
2. Every thing works as expected in zombie world.
3. when tp back to world where the plugin should not be enabled.  I can see blood effects for mobs. & the Ender Perl is still a grenade and not a teleporter like normal.

What is the expected output? What do you see instead?
In world where plug-in is disabled.
Mobs should not show bleed effect
Ender Perl should not be a grenade

What version of the product are you using?
R: BackFromTheDead v0.9.0 for CB 1.4.7-R1.0 Feb 19, 2013

Do you have an error log of what happened?
No errors reported.

Please provide any additional information below.
Sorry first time here so posted the problem on the wrong page ... opps.
Found this ticketing system so sent a ticket ^_^  Hope this helps,
I love plug-in keep up the good work.  ^_^