Dashboard Edits Not Saving

When editing a dashboard, for changes to save correctly the WebUI site must have a config WorkingMode value set to "Production" (rather than "AppDevelopment").

Otherwise after saving a dashboard the page refreshes to its previous state and any edits are lost.

To change the setting, open the config file: [INSTANCE_DIRECTORY]\Inetpub\WebUI\Web.config and change
<add key="WorkingMode" value="AppDevelopment" />
to
<add key="WorkingMode" value="Production" />.