Documentation Theme Broken and Side Navigation Bar Missing Post-Confluence Upgrade
Platform Notice: Server and Data Center Only. This article only applies to Atlassian products on the server and data center platforms.
The Documentation theme is broken, and the left navigation bar is missing post-Confluence upgrade
The wrong documentation theme plugin is loaded (instead of the one bundled with Confluence)
Take a backup of the Confluence Database. Then run this query to remove the wrong plugin:
DELETE FROM PLUGINDATA WHERE PLUGINKEY LIKE '%com.atlassian.confluence.plugins.doctheme%';
After that, shutdown Confluence, remove the plugin caches from the Confluence Home Directory:
Then startup Confluence