Hello,
Today I was doing Razorfen Kraul. Behind the last boss is Willix the Importer, who gives the quest Willix the Importer, an escort quest. My friend accepted the quest, and, as with every escort quest, you get the dialog box to accept it as well when someone in your party accepts it. However the accept button was greyed out for me, telling me I needed to make some space in my quest log to accept it ; but i was at 22/25, meaning I did have space for it. I had to abandon 3 quests to get to 19/25 to be able to accept it.
This happened on Nashuri on Deviate Delight.