When I try to enter in custom structure option in permalinks and insert /%postname%/
When I click save changes it reverts back to Post Name.
It is my belief that the newer version of WordPress finally incorporated the feature most commonly used into their versions 3.3.1 & 3.3.2.
If you look at what it reverts to.. it’s “Post name”, which is what you want.
Hope that helps.
