Caught a bug in the instant preview. As long as 3D was the saved value, borders would instantly change correctly. If saved value was Light, Dark, or None, the instant preview wouldn't add the borders not shown on page-load.

git-svn-id: https://plugins.svn.wordpress.org/admin-classic-borders/trunk@818578 b8457f37-d9ea-0310-8a92-e5e31aec5664