The devs messed[Blingtron 4000] with the last hotfix from yesterday
The Problem:
With Engeneering you can make this item [Blingtron 4000] which spawns Blingtron 4000 and this creature should give you quest. But after the last "hotfix" from 25 July 2016 the deves messed it with trying to fix something and now you can not take any quest from the creature.
http://www.wowhead.com/item=87214/blingtron-4000 - Item
http://www.wowhead.com/npc=43929/blingtron-4000 - NPC
http://www.wowhead.com/quest=31752/blingtron-4000 - Quest
Report: https://www.warmane.com/bugtracker/report/28748
There was one issue which was reported two days ago by me to Mmorpgrussia, but since developers broke it even more I wont report anything anymore.