For some reason the system is not allowing me to enable their profiles on one of my user groups.

I don't have this issue on any other type of group.

 

Have you perhaps switched off the ability for that user to actually see profiles at a module level? You would be unable to see settings that dont apply to a group, and that would be the case if there is no over all permissions.

Nice catch!

I have added a new group at some point and not known to go back and change this.

There are lot of settings across the site.

Thanks for your help.

No problem at all. Glad to hear that was the issue and you have what you need there