Hi!
I install latest version of silverstripe and I try to Work with security group.
I create a new geoup Group A and a user inside this USER A whit this permission: 'Control which group can access or edit certain pages'

I create a new geoup Group B and a user inside this USER B whit this permission: 'Control which group can access or edit certain pages'

Then my admin user give some access to 'about page': 'Only one this people' and I select Group A.

So when I enter with my USER A I think to access to my page and when enter with USER B not enter in 'about page'.
Instead the result is that I can't log in whit my USER A and USER B.

Why?
Can you help me please?