Not sure if this response is still relevant for the topic posters.

I installed a WALLC-S switch today and was also experiencing problems. Same as above, inclusion worked but no switched in the Devices tab to assign to scenes or groups.

This is what i did to make it work:

In Domoticz delete the ...

Wow, this did not even cost me more than a minute and it worked straight away! Excellent job and now my HomeWizard has an extended live, much thanks!