Which of these plugins is making cavespiders nonvenomous?

ChatManager,
Essentials,
Hawkeye,
Modifyworld,
NoCheat,
PermissionsEx,
PlgSetspawn,
WeatherControl

For some reason on my server, spiders aren't poisoning me or anyone else. Does anyone know if any of these plugins stop spiders from being venomous?

 

Did you ever solve this problem? My server experiences this as well.

Our plugins are as follows;
Essentials,
Swatchdog,
worldedit,
worldguard,
multiverse,
lwc,
mobarena,
mcmmo

Unfortunately for us, it looks like the only plugin we have in common is Essentials, and if its essentials that is causing the problem, my players will just have to deal with it.

 

I skimmed through the Essentials source code and it doesn't seem like it disabled poisoning. I guess it's either a glitch in 1.2 or you got very lucky and managed to escape without being poisoned.

 

Seems like it is a glitch so far-

I have removed plugins and have not been able to get poisoned yet - no one on the server can :/

 

The server difficulty in server.properties needs to be raised for them to poison you - I think they begin to poison on Normal difficulty.