I see some signs of deadness here

I installed the wallet on my mac but no syncing, installed the Elicoin clone, it is syncing
Yenten have a lots of problem that need to be fix, and since the developer have leaving the project, you can assume that Yenten is a dead coin.
I agree,but Dev is missing, it is worse than openly abandoning the project. In the latter someone could ask him to hand Yenten over to him/her. Even this option is out of the question as he cant be reached.