[DerekM]

If you want gutter color on by default on new documents then you can set that by modifying the default template (or making a new template if this isn't what you always want). To modify the default template, open the General tab of the preferences and click the "Edit New Document Template" button. Turn on gutter color for the template and set it to the color you want. Then save the template and close it. Now any new files you make will be created with that gutter color turned on. There's no way to apply this to your existing file though.

Let me know if you have any questions about this. Thanks!