I have done the recommended things — disabling, reinstalling, and made sure I have the latest version. Instead of updating, Turbo ends up failing with this message: Error: Download of ‘https://ninglundecember.wordpress.com/wp-admin/css/theme-install.css?ver=20090319’ failed, status code 404.
This was a separate issue compared to the one reported earlier in April. Thanks for providing the exact error message princo. That helped us out, and we were able to fix it. You should no longer see the error “Invalid manifest – No content returned.” If you are still having trouble with that particular error, please contact us in support.