Going into the network configuration panel, and selecting wicked as the network
manager, and clicking edit on a wifi interface, it correctly scans and finds
the SSIDs available. When selecting an SSID, the form indicates that the access
point is "ad hoc" and unencrypted. I set the encryption to WPA2-PSK, and no
matter whether I set the mode to ad hoc or managed, when I click next, yast2
immediately returns its starting panel (normally it would spend a while
thinking while it configures the network), and networking is not configured.

Wicked appears to be working correctly - I had saved some wicked configuration
files, and I can load these and they work. But given wicked's XML configuration
format doesn't appear to be documented, it has limited my ability to connect to
new wifi connections that don't use the same encryption scheme.

Normally, I do a zypper dup every week, so I always running close the the
latest Tumbleweed distro.

I first noticed this problem on 30th October, when I upgraded my network
equipment at home, and attempted to connect to the new Wifi 4 AP (aka
802.11ac). I can also confirm that it did work on October 15th, so the problem
could not have arisen much before that date.