I customized <all card types> with an off-white background (to be easier to read), then customized a total of seven cloned card types.

The problem is that any subsequent change to the appearance of <all card types> will override the customized appearance of the seven card types -- an "all or nothing" condition.

We need an option to "lock" the appearance of customized card types so that changing the appearance of <all card types> will not wipe out all other customizations. This might be accomplished by adding a "protect customization" check box to the Card Appearance settings.