I'm trying to interject a page during the checkout process to collect additional information from the user (language of books, location etc.).   We can't use attributes for all of these. 

Everything works, except when I try to send the user back to the Shipping.aspx or Checkout.aspx, it instead loads the mycart.aspx page, creating an endless loop.

Even if I remove my redirects and just type in the URL the page I want to go to, it sends me back to MyCart.aspx.  This is true even if I've already submitted past this - so anything this page sets is already set.

So basically I want a path like:

 MyCart -> Shipping -> Custom Page -> Checkout. 

What I get is: 

 MyCart -> Shipping -> Custom Page -> MyCart

And i can't seem to find a way to load in any other page.  Anyone done anything similar? tnks.