It may sound strange, but I have found about this coin only yesterday. Fortunately, I have found an old wallet.dat backup from the times I used the full BTC client (no bitcoins there anymore). Importing worked and I've got some Clams, but the client cannot sync. First it became stuck on some old block (almost three years ago). I have downloaded the blockchain from cryptochainer.com, and now the client just writes 'out of sync' and does nothing (but it shows 19 active connections to the Clam network). Of course, stacking does not work.