ASP.Net login page not logging in

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C#

ASP.NET

Ok, so I just had a problem that was solved where I couldnt use a custom HttpModule to do re-writing. Now, though, when I log in with the template created login screen, as soon as I get to the default page I get logged out for some reason. There is no code that should log me out! he code in the re-writer is the following:

var application = (HttpApplication)sender;
var context = application.Context;
var request = context.Request;
var response = context.Response;
var page = request.RawUrl.ToLower().Replace("/", string.Empty).Replace("?", string.Empty);
if (request.Url.ToString().ToLower().Contains("cms"))
return;
ACE.Dal.ACEEntities db = new ACE.Dal.ACEEntities();
ACE.Dal.Page cmsPage = db.Pages.FirstOrDefault(p => p.PageName.ToLower() == page) ?? new ACE.Dal.Page();
if (cmsPage.IsContentPage)
response.Redirect("ContentPage.aspx?pageID=" + cmsPage.PageID);

Thanks in advance.

Edit -- Info that may help:

From what I can see from my debugging, if I get the password wrong in shows the correct error and doesnt attempt to navigate away from the page. If I get the password correct, it navigates to the correct page, then once it gets there does a check to see if there is a user logged in. It see's that there isnt and redirects back to the login page.