In your screenshot it shows the channel defined as ‘velux:window:…:position’ whereas your item definition seems to be for ‘velux:rollershutter:…:position’ — so which one of these is not working?
In any case, there should not be any difference between the release version of the binding and the version in my PR concerning commands to the ‘position’ channels. I did not touch that code. I only added code for a new channel to handle vane/slat angle.
This is true. After you have finished configuring the KLF via its private AP, you need to power cycle it before it will accept connections on the LAN.
PS you may have seen in this thread that the KLF is very quirky concerning LAN reconnections. So while you are initially playing around with the configuration, I would recommend to disable the bridge thing in OH, then power cycle the KLF, and then re enable the bridge thing.