List of Viewport Scales Is Different or Missing

Issue

Your list of Viewport scales has changed, or is missing.

Solution

If you tried to correct this issue by editing the Default Scales List in User Preferences under Options, but the changes did not carry over to the Viewport Scales listed when you hit the button at the bottom right of the screen in Paper Space, here is the fix:

After editing the defaults, reset the scale list. The easiest way to do this is from the Command line:

• Type SCALELISTEDIT
• Type R (reset)
• Type Y (yes)
• Type X (exit)