I submitted bug 12613 some time ago, which I think is related to “Themes”.
Also submitted requested files, and did some troubleshooting of my own.
Realize that developers are likely busy tackling bigger issues.
Hearing comments about how various “Themes” can not all be debugged, but I never changed my theme. It is default out of the box on install.
I think it is a problem with the IPFire installation, because the data (system load, user, installation date) in the footer addon are also not completely output … Everyone is free to use the add-on or not …