Strange question to start in this topic...
But obviously you can start with a Raspberry Pi, Domoticz and a zigbee is stick. See https://www.domoticz.com/wiki/Zigbee
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Thanks for your awkward answer!

OMG! This solution was realy simple...I totaly forgot about that! But now i remember!Most of the GUI related issues, especially when they occur after an update, are cache related. The solutions are summarized on this wiki page