Can't edit brush size, etc

[harryllama]

Hello, I'm running 2.8.16, and I'm having trouble adjusting the brushes. Even though I've changed the brush size in the Brush Editor, the size doesn't actually change. I came across this link (http://www.gimptalk.com/index.php?/topic...what-i-do/) in which someone said that the brushes are read-only, and can only be adjusted with Tool Options. That DOES adjust brush size, but there's no slider for hardness....

So, I tried creating a new brush, but that brush suffers from the same problem of not being adjustable...

Help!

Harry