Does the user role you are logging in as have entity access to the entity of the data in the new column? Is the datagrid on the home page (which you are redirected to after login?). Maybe you can provide a bit more details and a screenshot.
As Ruben Said check whether the logged user has enitity access and Moudle role is mapped correctly to project security.
You can also provide us the log message in the server. If not logged in server, inspect the page while the error occured and check in the browser console.