I have Windows 10 on a Lenovo X61 PC. I have a desktop shortcut to Command Prompt with color options set to grey text / black background. I run the editor using >EDIT /B filename. For a year this gave me white text / black background for both command lines and the editor window. Now suddenly the editor window has grey text on a red background. It also has a red border and red text on the tool bar, with or without the /B switch. I noticed that if I look at options>color on the tool bar at the top of the text being edited, the background is set to black but the displayed background is red. I would be happy to omit the /B except for the annoying bright red border.
I have spent days trying to figure this out. I ran a Windows 10 check of system files and boot setup. I ran a hard drive test. I cleaned the registry (killed Windows login - I had to repair the registry). Now I am back to exactly where I started - only problem is a bright red DOS editor background and border. BTW, the editor without the /B option gives correct text and background colors. Does anyone have any ideas about this?