Thank you for your post.
Something is telling the third user to not allow scripts to be modified.
Are you receiving any kind of error message? If so, what is it?
Have the third user create a new database file. See if the user has the ability to create and modify scripts. This would be the quickest test.
Make sure the third user is accessing the original file using user name Admin with no password. If so, then make sure the privilege settings were not changed to the original database.
Any additional information you can provide may be helpful in narrowing the possible causes.