I dont know how this happend. The last thing i done enabled the raytracing in project settings. After restart and recompile the whole project and some crashes, i wanted to work again with my Niagara Setup. But suddenly i cannot select a Color in Niagara Particles via Curve Parameter. if double clicked nothing happen. When i click right → Choose Color, The Window appears for a sec and then disappears again. I tried a new EMPTY (without raytracing) Project with 4.26. Same behavior. I tried to restart/uninstall /Verify the Install Still the same Problem. In Version 4.25. the Color picker works… I dont know what to do, i have to get the color picker there… What can cause the Problem?
Here you can see the Problem. Niagara Color Picker BUG - YouTube
I cannot work further with this bug. Highly appreciate any Problem Solving or other way to access Colors.