Bukkit

What steps will reproduce the problem?
1.
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What is the expected output? What do you see instead?
Monsters can see me when i'm in vanish mode. Also, some players can see me slighly (i've some black points around me, like @). Sometimes I even can and can't see an admin vanished.

What version of the product are you using?
Latest

Do you have an error log of what happened?
Nope

Please provide any additional information below.