i worked with 4.26 for 3 Weeks now, also the Color picker worked till unreal decided to show me the dark side. Alt Tab doesnt work unfortunatly. The Window is not even in background it is just closing immediatly :/. Thanks for your hint about the curves. the bug appears in there as well. So it seems like the overall Curve Vector Picker got some Problems. In Light or Materials the Color Picker Window works. I submitted a bug report now but i guess nobody can reproduce that :/. Thank you for the tip with the curves. Appreciate your response.
I am using 4.26.1 is there any way to download 4.26.0 ?