In Access 2003 my form updates a SQL server 2005 backend. The problem: on modification of data the cursor blinks (arrow to hourglass) and the Calculating... message flashes at the bottom ot the form continuously. This continues until the form is closed. The record is updated. When adding a new record with the attached sub-form I get SQL key constraint error messages before I can select a value from the appropriate combo box. Identity column is...