Hi,
Yes, it happens whenever I try to delete an existing label and change the label color. I’m using a 64-bit Windows OS. For example, in lumen segmentation, I first draw the boundary, slice the lumen, and interpolate to create the lumen. Once interpolation is done, I try to delete the boundary and annotate the calcified plaque with another existing label (e.g., label 3), which is usually blue, but I use pink. When I try to change the label color, the window automatically closes, and I have to redo everything if I haven’t saved.