Hard to qualify as a scam but it's certainly close enough to warrant warning others about it.
Sent a number of NXT to ShapeShift about 10 days before the IGNIS airdrop. The exchange failed (still shows awaiting deposit), and due to ShapeShift being absolutely crap, they still haven't responded to my support request even to this day.
From other NXT users who have also experienced this same issue during this timeframe, I have found that ShapeShift are refusing to return the airdropped IGNIS saying they "don't support it".
So we're supposed to believe that ShapeShift are just going to ignore the potentially millions of $ worth of IGNIS? I doubt they're going to leave these tokens unclaimed for the rest of time, don't you? What a convenient problem this has turned out to be for them. NXT deposits break before the airdrop, they keep the IGNIS and refund the worthless NXT back to users claiming they've done their bit.
So, advise? Never, ever, ever use ShapeShit. You'll be waiting for weeks for a response if anything goes wrong, and they're basically acting as thieves in this instance.
That is straight out scummy. You should see if maybe you guys can get together and sue them.