Since my vision is poor, I have been experimenting with various colors to find combinations I can see. I save the color scheme and give it a name. I then decide to change one of the colors but as soon as I edit the color it wipes out the saved file and sets all the colors back to default. Then I have to go through the whole list of colors again and save the file. I use the same name again but it doesn't appear to be modifying the last file, just starting over. Is there something I am doing incorrectly in saving the color scheme?