I was testing out the new update in SMP and a major glitch was present... Other players were invisible... This can cause major griefing and we wont be able to ban a griefer if they are invisible.

Aw sweet! I wanna be invisible!
*Sees random TNT blocks appear* Uhm Brooni--- *BOOM*

Wow SMPS gonna be a lot different with mobs and such... Do you think broonie will be able to set a boundary with no pvp?