by AverageJoe » Thu Aug 06, 2015 7:01 pm
Abandon the quest and re-obtain it to see if it lets you turn it in.
If not, log out, disable all addons, and log back in to see if it lets you turn it in.
If not, log out, delete your WDB folder in your WoW folder, and log back in to see if it lets you turn it in.