When a user, of a certain role, the user is unable to edit their own user profile/data. When they are no longer that role, they can edit their profile.
Error is:
"The user was not saved because of the following problem:
This form can not edit users with a role of XXX"
(Role is not displayed if there are multiple roles).
Have checked Access Control for forms, the appropriate boxes are ticked, so not sure the issue.