BINGO! My app updated last night and, while writing again to Kasa, I tested the new version. It has reverted, so it allows unsecured wifi! Problem over, though I am continuing my letter to ask them...

Big problem. And a new problem. I bought two identical HS100's three weeks ago. Ten days ago I set one up with no problem. Now I try to set the other up, and it won't connect because I have no...