Cinnamon's developer said on Posted 20 July 2014 - 10:07 AM:

note - cinnamon coin may be dead -- i cannot come up with a good solution to reset the difficulty and restart the chain properly ---
my c++ coding skill is just not good enough,
i have shut the nodes down and will contact coins e to notify them to delist the coin.
I am going to go and watch a movie now or do something else. I had enough of this coin.

https://cryptocointalk.com/topic/1220-cinnamoncoin-cin-141-proof-of-stake-only/page-12

Then regarding Proof of Stake (which Peercoin still runs under) he said:

without proof of work i cannot guarantee the stability of the blockchain
proof of stake is something that is best left for experimentation,
proof of work is the best reliable way to run any cryptocurrency

Co-incidentally, Sunny King, the creator of proof-of-stake is actually going to be on the Beyond Bitcoin mumble radio show tomorrow Aug 19/16. I wrote a post announcing it.

Proof-of-stake does work. But in order to be a coin developer, you should know good C++ if that's what your coin source code is running.

Now the Cinnamon coin developer has admitted he runs other coins too:

just shut cinnamon coin down and focus on my other projects I currently have running (several coins some more successful than others) and I am currently developing on my own and with a few others a few new coin 'type' systems which are in various stages of development.