If you are using the custom footer, please note that patching your Intranet Connections installation will overwrite this file currently. It is advised that you take a backup of this file prior to patching so you can replace the file after the patch has been applied. The file is located, by default, in \...\Intranet\Menu\custom_footer.cfm
This is valid for all patches up to and including patch 9 for version 13.0 and patch 3 for version 13.5.
This behavior will be changed for future patches so the file is no longer overwritten.