I bet my mount is sitting inside of the unlootable Slabhide I just killed >:[
PLEASE FIX THIS BLIZZARD!!!!!!!!!!!!!!!!!
One way to circumvent this issue is using targeting hotkeys.
Can't target the mob? Try using Tab to cycle through until you get the right one. Also try using the /tar slash command.
This works on dead mobs as well. Another useful couple to bind are "Target Last Hostile" and "Interact With Target." Kill a mob, but can't loot it? Target Last Hostile (or use the slash command /targetlastenemy), then Interact With Target. If Target Last doesn't work, use the /tar command until you find the correct dead mob.
Use these workarounds until there's a fix. My wife is having the same problem and is running one addon: Skada Damage Meter. Even without it she has this issue.
Curiously enough, I've noticed that loot is dropping from the Eye of the Legion mob in Well of Eternity, and nobody can click to loot them. Using the tricks I outlined above, you can. I've run into several greens and even a zone epic on their non-existent corpses.
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