The same here with me.I am in the same position as drgsldr69
I completed the Druid's Deep chain the first time in a group (with one other person) and got 3 commendations as the end reward. Thought to myself "this seems a good way to get commendations at my level (18), as I can't get into the King's Forest until I am 20th", so I repeated the chain solo ... except I get stuck and can't enter the final quest. I have completed the first 3 quests with no problem. Tarim has a big green tick on his head, but when I try to talk to him I get his text about the weather (which is what he says to people not eligible for the quest) and does not open the dialog box to grant me the quest.
I've tried abandoning the chain and associated quests, but that produces an error saying "you can't abandon this quest while on this goal" (or something similar).
I've submitted a bug report. I've petitioned the GM who says "this is not on our bug list, and even if it was we can't fix it - please sumbit a bug report and pray that the devs decide to look into it".