Thread:Project:Support desk/Vector.css edits not taking

Mediawiki 1.24.1 at http://awoiaf.westeros.org/

Following the instructions in Interface/Sidebar for how to widen the sidebar to accommodate a vertical banner ad, I'm finding that edits to Vector.css don't seem to be doing anything at all. I flush various caches -- MediaWiki's own, Varnish, Cloudflare, browser -- and I simply am not seeing any sign that the Vector.css changes are actually having any impact on the skin.

I truncated the objectcache, too, and I tried setting $wgUseDatabaseMessags to true as the troubleshooting suggested... and nothing, not as far as I can see.

Any suggestions as to what I should look at next?