Not able to edit profile field groups

I am setting up a new site using multisite and Studio -- which doesn't seem to be on the dropdown list here, by the way. My problem is that I have set up various profile groups but I can't edit them. When I click on Edit and then display the Edit Field Group screen, all I get is the Field Group Name and a button for Edit Field Group. No way to edit the parameters. If I click on Edit Field Group I get There was an error saving the group. Please try again.

Thanks