Are certain field types unable to be truly set to Read Only in Field Permissions?
Using Field Permissions for a specific profile, I have set a number of fields in a form to Read Only. However, users with the specified role can still edit specified Radio fields and Date fields even though they have been set to Read Only.
Single Line Text fields and Dropdown fields I set to Read Only in Field Permissions are not editable by the profile (behaving as expected). Therefore, I know I have set up the Module Level Permissions and the Field Permissions for the profile correctly.
Only Radio fields and Date fields still allow editing when set to Read Only.