When users are editing the widget colors, they may not notice the "Save and Preview" button above these fields. Place a second "Save and Preview" button next the the "Save" button at the bottom of the form.
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This happens when you configure a widget and select edit color.
When you save the new color, it should just save the colors and stay on the configure page so you can preview and continue working on the configuration. Currently save colors returns you to the overall configuration page for the contribution page.