Spooncraft

People were shocked on Tuesday night (and again last night) when Void Reaver no longer targeted or faced players before launching an orb. There are also reports that invisible orbs are spawning from the ground and that sometimes VR launches two at a time. Obviously this is making the fight more difficult than it used to be but by no means is it impossible.

The biggest gripe seems to be that due to the patch Deadly Boss Mods among others are just not functioning properly with the bugged encounters. Blizzard did comment on VR.

Void Reaver intentionally no longer targets or faces players that he casts Arcane Orb on. This was done to fix a bug.

There is a bug in that there is currently no combat log message for him casting Arcane Orb (just the impact message), causing boss mods to not work. This will be fixed in a future patch.   (src)