I was doing Overwatch Keep as a duo with my daughter on Monday. We had a great time with the place but had several instances of treant mobs that were invisible to one or both of us. We could kill them but then the person who could not see the corpse could not loot it. At least you couldn't click on it - I didn't see if there was a /loot command like EQ.
On one occasion I saw the mob but it vanished as soon as combat started.
fwiw we were playing side by side so I could see the mob on her screen and vice versa. Two very different machine specs with different settings and graphics.
Is this a known glitch or a conspiracy to deny me all that lovely grey loot?