Originally Posted by
NakataVagrant
Late to the party but it happened to me while doing a mythic shadowmoon burial grounds last week. On the first mini spiders-big spider-bats pull after the 2nd boss I wasn't able to target the big spider. I was tanking as a brewmaster. I use the default UI mainly with DBM, AtlasLoot, Recount and WeakAuras.
There was another scenario in the same dungeon this time with a sub rogue but it was a little different. I was not able to "physically" target a mob and I would have no target yet I could actively single target attack the "no target" target (backstabs, ruptures, etc) by tab targeting. The "no target" target was the first big shadow elemental in the instance.