I finished the Tree of Life and went to get the Oakheart quest. When I got to him there wasn't an exclaimation mark or question mark over his head. I had not been in the tree before, so I have never done the quest. I tried switching realms, waiting 30 minutes and came back the next day. The mark does not appear.
I know this is a very important quest to gain access to Malistaire.
If you did all of the other quests that were required "before" Oakheart, there might be a bug. If so, you might need to contact Support by e-mail.
I know I posted this before, but here it is again in case you need the info...
If Theurgists are having trouble completing your level 48 Life spell quest, you must complete a sidequest in MooShu in order to have access to Oakheart in the Jade Palace.
You must complete these quests, in this order, to get to Oakheart in the Jade Palace. A lot of these quests are the same side quests that you need to complete for the “Wizard Tours” quest or Obsidian Chests quest to get access to the one chest in MooShu.
Cave of Solitude 1. I’m Cursed (from Mossback) 2. Rock On (from Mossback)
Kishibe Village 1. Wear Your Gloves (from Mossback)