Maybe try from scratch. Put an unbound combo box on your form. In the Row Source Type, select table/query and in Row Source, type: SELECT [tblYourTable].[SSAN] FROM tblYourTable;
Then, in the AfterUpdate event, I hace this code:
Private Sub cboSSAN_AfterUpdate()
' Find the record that matches the control.
Dim rs As Object
Set rs = Me.Recordset.Clone
rs.FindFirst "[SSAN] = " & Str(Me![cboSSAN])
Me.Bookmark = rs.Bookmark
End Sub
This works great for me as I have it here. I copied directly from my code and only changed the field names.
I'm stumped other than this.