Same. It's a real shame they are shutting it down. To be fair, I haven't used it in a long time.
I'm now wondering how do I rescue my data from StumbleUpon, I don't see any way to download it. I looked through the settings and my profile page. I even tried this new mix.com website and it didn't transfer any of my data from StumbleUpon. Anyone know whether I can export my data somehow?