In the latest versions of PhotoLine, if we set a gradient color and then try to manually edit any of the gradient colors, add a new color, or move the colors on the bar, it's not possible.
I guess this problem was fixed in 25.00b7 (In Color Editor when left mouse click on Gradient dot, it behave like right mouse click.)
No problem in 25.00b8
Problem was fixed in last release version 25.01 https://www.pl32.com/forum3/viewtopic.php?t=7224
"Gradient editor in dialogs: Clicking in color bar showed pop-up dialog instead of selecting color/gamma or creating new color."
Weird, it looks broken in version 25.01—clicking the Gradient Editor does pop up a window, but it doesn’t give any way to add a new color to the gradient.
You can’t drag the colors around either; all it does in this version is show the popup with those options.
I find the old way much nicer and more intuitive to use.