When trying to load a page served by Magnolia 3.6.1 on a computer in the departments of the Canton of Bern (and also Basel Land) the browser is only displaying hieroglyphs instead of the page (public as well as admin pages). Only the standard login page is displayed correctly.

It's not a character encoding problem: You cannot look at the source code with a few mangled characters. It's nothing but hieroglyphs (see attached screenshot).
I suspect it to be a problem with page compression - I did not have the chance to try it with compression turned off.