C# Winform Table Adapter suddenly not saving to DB

I have a C# Winform app that I wrote a couple of months ago that has been working fine, but recently has ceased to update my database when Im calling the TableAdapter.Update function. I have this in a try / catch block, and it is not throwing any errors. If I put a Breakpoint on the Update line, I can see all my new values in the various form fields, but it again it doesnt throw any exceptions. My connection string to the DB must be good because my Fill query works.

Below is my code:

 private void SaveButton_Click(object sender, EventArgs e)
        {         
                try
                {
                    this.Validate();
                    this.taEditBindingSource.EndEdit();                  
                    this.taEditTableAdapter.Update(this.ONLINE_STOREDataSet.taEdit);
                    var form = new SaveConfirmed(); //Displays my Custom Confirmation Box
                    form.Show();
                }
                catch (System.Exception ex)
                {
                    MessageBox.Show("Update failed:\n" + ex);
                }
				
        }

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Any ideas are appreciated.