The Hidden Forest

I spoke to Elzari in the Hidden Vale and received the letter to Ahenu in Timorous Deep.
I then went to Ahenu and turned in the letter. I then clicked on the link to start the rest of the quest dialog, and he didn't say anything more. He didn't respond to hails after the turn in either.

I remember him being very finicky about proximity. Try standing on top of him and then go through his dialogue.