When you open Alter Table screen, if you only change the case of a column name, alter table will not detect a change nor try to update the table.
I inherited a database with mixed case column names. When attempting to alter the table and change the column name to lower case, I can not use the Alter Table tool as it wont detect my change. Eg. Original column name = Company_Name, retyped in Alter Table=company_name. But, Alter Table tool, doesn't see the difference and create a alter table statement.
In using version 9.51