Yes you're right, the site is currently on the blacklist (the blacklist became more strictly since version 0.54) and no, there aren't any running mining scripts on the site.
Some scripts might use the web-wallets to store the mined coins, so the url landed on the blacklist. I'll change the blacklist in the upcomming version (will be published in a few days), to prevent this unessecary behaviour. At the meantime, you can just disable the blocker on coinbase :)
Sorry for the trouble.