The Calculated Data Lock window cannot be opened but only for 1 user. All other users are able to open the Calculated Data Lock window.
That this is only failing for one user shows it's a problem with the control layout saved for the user. To solve this, we'll need to find the user_id according to the user_name, then Delete the calculated_data_lock layout for that user_id.
1--select the user id
select user_id from t_users
where user_name = '[user_name]'
2--delete the layout entry from t_control_layout
delete from t_control_layout
where user_id= [user_id]
This should then clean it up and allow the user to access the page again.