I use version 4.5.60 and do the following: I edit a table (remote connect to SQL2012Express) and add two new columns (one bit, one int) with NOT NULL and Default Value. I click "Script change" and I execute only the two ADD COLUMN statements. It works, I check it with "Retrieve data". I close all tabs and go to again to "Edit table". I get the old schema (without the new two columns). I close your application and start it again: all works fine!