Session times out in just a few minutes

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C#

I've got the following code in a Master page:

if ((SubmitterRecord)Session["CurrentUser"] != null)
           {
               SubmitterRecord SubmitterRec = new SubmitterRecord();
               SubmitterRec = (SubmitterRecord)Session["CurrentUser"];
               LiteralLoggedIn.Text = SubmitterRec.UserID;
               userpanel.Visible = true;
               loginpanel.Visible = false;
           }
           else
           {
               loginpanel.Visible = true;
               userpanel.Visible = false;
           }

This has worked "flawlessly" in development but it seems to be losing the session state when I've installed this on my ISP's servers. I can "login" and leave the page up for 10 minutes and then go to another page; when that page displays it's as though I haven't logged in. I've installed this on two different ISP's (one of them godaddy.com) and get the same problem. I've also added sessionState timeout="60" in the web.config, but that doesn't help either.

Any help would be appreciated!

Thank you,

Dennis Derringer