Mac Wallet working again...
Couple of things for OSX users.
Library is not visible by default with OSX. Look up various ways to make library visible.
For me, once I was able to find my library, application support, dark coin.... I deleted everything but wallet.dat. I also deleted dark coin qt in applications. Then, I downloaded fresh and found a peers.dat file on another forum. Before I opened I added the new peers.dat.
Finally back to normal.