Now when I say no css/js, I do not mean the paths or urls are incorrect, and this is unlikely to be a css/js merging issue (as it was never enabled, and I’ve tried both ways). No, I mean they are literally not included in the HTML.
Observe the top of the HTML source of a typical admin page which should have many css/js link and script tags;
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<body id="html-body" class=" adminhtml-system-config-edit">