Wish I'd seen this earlier. Been trying a whole bunch of coins to mine and quite a few times I ended up on a pool by this outfit.
I have sent an email to ask what the issue is, only a few hours ago so I'm not quite ready to damn them yet but I'm not holding my breath. It seems daft that they would do this, I'd point 10 times as much stuff for a huge time their way if it paid normally. I don't understand why they'd not fix it.
Treat with caution unless you hear otherwise would be my advice. I've removed all the script files I had pointing at them to my 'do not use' folder. Shame.