I'm having a few issues with the 4.0.10 upgrade: 1.) I cannot access the configuration files for any of my virtual hosts -- I am seeing the following error message in red when clicking on the configuration for a virtual host (these worked fine in 4.9): /home/myusername/public_html/config/mywebsite.com.xml is not a valid file. 2.) When downgrading back to 4.9 -- I am receiving a session error message and a 503 error on my website. Any idea what might be wrong? Thanks!