Recently one of users started getting the below error when he tried to open a record from grid.
We checked, and the user was having the Write Access to User Entity UI Settings entity (2500) through the Team’s security role that he was member of but wasn’t having the rights through the security role assigned to him.
The first arrow shows the missing Write access through a security role assigned to the user and remaining are Write access through the Teams he is part of.
To fix the issue we had to give Write access to the user on the security role directly assigned to him. Basically, user needs to have this right explicitly in his role, as it is User specific entity.
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Hope it helps..