I don't think it happened directly after an upgrade, but the CSS for my whole back end is not showing. It's there on the log in page, but once I'm in the dashboard, it disappears.
I'd really appreciate it if someone could list a structured approach to finding the problem. I've looked via ftp and all the css files appear to be there.
Where should I start and how do I isolate where the issue is coming from and hence how to fix it. Thanks.