Guild Wars 2

The Predator Vol. 1 Legendary Collection

1. Scarlet’s Prototype Mechanism in Scarlet’s Secret Lair cannot be picked up.
2. The Research Notes item that is supposed to be found in the chest at the end of Professor Portmatt’s lab in Bloodtide Coast cannot be looted.
3. In Quandary Scratch in Mount Maelstrom, you cannot interact with the Experimental Rifles if you have completed the Renown Heart “Assist the skritt with their fortifications”.

These three items are blocking progress towards crafting The Hunter.

I found a bug where mobs can run through the walls of a keep. Has anybody else had this happen to them before?
Link:
http://www.youtube.com/watch?v=WrcaarF2OMM&feature=youtu.be