simple LinkButton click not working/firing

I have a plain and simple asp.net test page and I can't get the Button click to work. It works flawlessly on my localhost/test machine but not on the main server. Any ideas?
By clicking on the image on this page you are redirected to the test page - http://shareyourloss.com/photoalbums/viewphoto/postid/7470
Here is the test page on which the button click does not work - http://shareyourloss.com/photoalbums/testpage?PostID=7470
As I said a simple page, with the following code is in the code behind for the button click event:
protected void LinkButton1_Click(object sender, EventArgs e)
{
     if (!String.IsNullOrEmpty(HttpContext.Current.Request.QueryString["postID"]))
     {
       & ...