Sorry, my mistake!
On the first graphic you showed (the dreamweaver recordset) you don't apply any filter at all (as thats what DA Search does for you).
So take any filters out of the actual Dreamweaver recordset.
In the DA Search window
1. Looks Correct
2. Looks Correct
3. Looks Correct
4. in the php tags replace the $_POST['search'] text (both instances) to $_GET['filter']. You are pulling the data back from a URL string so you need to use $_GET. $_POST only works when submitting a form.
Hope that helps?