So, when you go to the orange circle and open up your Quest Journal, select the Levequest that is listed under Leves, not the quest that is the unlock quest (remember when unlocking Leves, you get two quests. The Unlock Quest and the Levequest itself.)

When selecting the Leve quest, in the second panel of your log, along the bottom, between Map and Abandon, there isn't an Initiate button?

I don't mean for this to sound condescending if it does, I'm just trying to make sure that you are trying to initiate correctly as I personally haven't had a problem unlocking Leves on my 50.