Once in a while I have to hook up my units BU16 & TEK2 to grid editor to make little adjustments to my configuration. As expected I got a firmware warning for updating the firmware on both units to 1.5.5 which of course I did. And the Grid Editor itself wanted to update to 1.7.2 which I did. After updating, my units still work as intended, but grid editor is not able to fetch my units and therefore my configuration is not read by grid editor, so no editing possible. After decoupling from grid editor my units still work as intended.
Edit : After restarting everything seems to work now. Fetching works as expected.