Spotted a small issue with your Setup code that creates the images.  There are two images where you check for a png and create a gif, and hence it will run everytime.

Cheers

Andy

if (!File.Exists(Server.MapPath(folder + "/arrow.png"))) Resource.arrow.Save(Server.MapPath(folder + "/arrow.gif")); if (!File.Exists(Server.MapPath(folder + "/cross.png"))) Resource.cross.Save(Server.MapPath(folder + "/cross.gif"));