I saw (I think) a post about this in the GD section, but thought I would post it here.
Last night / this morning, on several world bosses I found I was unable to place a ground target reticle underneath a World Boss. I saw this with Fire Elemental, Mark II Golemn and the Jungle Wyrm. In all 3 cases I was on my Thief, trying to use Shortbow. Whenever I tried using Shortbow 2 or 4, the ground reticle couldn't be placed under the boss, but rather it's as if it hit a barrier. I was still able to shoot and hit with both SB 2 and 4, so long as I had the boss targeted.
I haven't changed any of my ground targeting settings since before the patch, so this is new. I have no trouble using a ground target reticule on any normal, veteran, elite or champion class mobs - only on world bosses.
Had zero issues with targeting melee attacks or SB 1.