Originally Posted by killahsin
yes it is a line of sight issue. its a bug in the los code, like mobs flashing invisible is. like mobs 50 feet away 'seeing' you attack a mob so they aggro, but one standing enxt to it that isn't 'looking' doesn't.
They can all be looking at you and they will still not all aggro. I've seen it many times. Then there can be some along the way that wont aggro if they are looking at you.