Yes. It's a Steam ownership check. It's usually finished fast enough, but I suspect an SSL renewal on my site might cause some delay (though it works after it). I'm considering to remove it, but please give me some time.
Fixed this now. Please update your steam version to the newest build.
Let me know if you get any other issue. (Email/ twitter/ discord might be the fastest if you need urgent help)
Just checked it out now. Thank you, it works without freezes now!