In version 4.0.3 the HyperLink function displays the full url instead of the link text that is provided. This worked properly in 3.1.3.3
cell.Value = "Google";
cell.HyperLink = new Uri("www.google.com");
Will display http://www.google.com in the excel cell, not a clickable Google.
cell.Value = "Google";
cell.HyperLink = new Uri("www.google.com");
Will display http://www.google.com in the excel cell, not a clickable Google.