Hi Bruce,
If a user has access to editing customers, they can edit any field. There is no security to prevent accessing specific fields for customers but allowing others - with the special exception of customer Notes.
As soon as security group changes are made and saved, they should immediately take effect. A log out and re-log in should not be required. Of course, if a change is made to prevent a user from access to a function and they happen to be using it at the time, they are not kicked out of the function, but it will become unavailable as soon as they close the function.
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Regards,
Softrak Tech Support