Whitebalance cannot be used: After I open Lightroom I can adjust the Temperature for one picture. If I go the next picture, I cannot adjust the temperature anymore. I have to close Lightroom and open it again.

Hi ​@jakob_7220 , Welcome to the Lightroom Community forum! To better help you with this issue, we would like a few more details. Can you send your system info, a screen recording of the issue, and a numbered list of the exact steps needed to replicate it? You can find your system info by going to Help > System Info, copying and pasting it into a text file, and attaching it here. Thanks! ^CH