So the systems editor is borked

I opened one of my saved drafts to work on it, and was presented with this lovely sight:

…That wasn’t there before.

Oddly, it doesn’t seem to affect the interface, I can still select the icons at the top and they still do the same things, as far as I can tell. But it’s a little tough to work like this.

This is almost certainly a caching issue. Doing a full refresh, by holding Ctrl or Shift and clicking the Reload button in your browser, should resolve the problem.

I’d already tried that, and it didn’t work.

I cleared my entire browser cache, and that fixed the problem.