Aggro Indicator not disappearing (in Classic)
This issue has been occurring for me while running 5-man dungeons in Classic. I have the Aggro Indicator set to display a red square in the top-left HoT Icon slot (the #1 (closed) position).
I have noticed that occasionally, the Aggro Indicator will not disappear even when there is no longer aggro on a player. For example, when we finish fighting a pack of mobs and drop combat, the red square will remain on the player's frame indefinitely. I am able to fix it with a /reload.
I'm not sure what the cause is, but it happens a few times every dungeon I run.