Custom.css is not loaded in version 0.9.1

This happens for me on both Windows PC and iPad.
On PC just now I cleared the whole cache from:

Still same problem.
Created a whole new graph. Same problem.
Removed all installed plugins, but nope same problem.

I don’t know what’s up, but I can’t get it to work at all. No matter what I try.
So any extra suggestions for what to try are welcome. Otherwise this is a bug.