is anyone running 1.6 in medium trust? unable to access shopping cart

I have 1.5 setup and running on two domains, both with godaddy (my real one and a development/test domain)...  last night I upgraded the dev domain to 1.6.  

The upgrade itself went smoothly, however, now I get this error whenever i try to add to cart:

System.NullReferenceException: Object reference not set to an instance of an object.

[NullReferenceException: Object reference not set to an instance of an object.]
   NopSolutions.NopCommerce.DataAccess.DBProviderManager`1.Initialize() in DBProviderManager.cs:73
   NopSolutions.NopCommerce.DataAccess.DBProviderManager`1.get_Provider() in DBProviderManager.cs:165
   NopSolutions.NopCommerce.BusinessLogic.Products.Attributes.CheckoutAttributeManager.GetAllCheckoutAttributes(Int32 languageId, Boolean dontLoadShippableProductRequired) in CheckoutAttributeManager.cs:187
   NopSolutions.NopCommerce.BusinessLogic.Products.Attributes.CheckoutAttributeManager.GetAllCheckoutAttributes(Boolean dontLoadShippableProductRequired) in CheckoutAttributeManager.cs:168
   NopSolutions.NopCommerce.Web.Modules.CheckoutAttributesControl.GetCheckoutAttributes() in CheckoutAttributes.ascx.cs:55
   NopSolutions.NopCommerce.Web.Modules.CheckoutAttributesControl.CreateAttributeControls() in CheckoutAttributes.ascx.cs:69
   NopSolutions.NopCommerce.Web.Modules.CheckoutAttributesControl.OnInit(EventArgs e) in CheckoutAttributes.ascx.cs:61
   System.Web.UI.Control.InitRecursive(Control namingContainer) +333
   System.Web.UI.Control.InitRecursive(Control namingContainer) +210
   System.Web.UI.Control.InitRecursive(Control namingContainer) +210
   System.Web.UI.Control.InitRecursive(Control namingContainer) +210
   System.Web.UI.Control.InitRecursive(Control namingContainer) +210
   System.Web.UI.Control.InitRecursive(Control namingContainer) +210
   System.Web.UI.Control.InitRecursive(Control namingContainer) +210
   System.Web.UI.Control.InitRecursive(Control namingContainer) +210
   System.Web.UI.Control.InitRecursive(Control namingContainer) +210
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +378



After searching the forums, it seems it's a trust issue.  

Can anyone confirm that they are running 1.6 in medium trust and if so what is the fix (I don't care about the PDF's, but I need the site to function)?

Thanks in advance!
Jim

See this link https://www.nopcommerce.com/boards/t/3087/creating-a-pdf-invoice-in-medium-trust-environments-a-solution.aspx; it may be your issue.  I've been running a site, not a nopCommerce site however, that generates a ton of PDFs with iTextSharp and I had to recompile with allow AllowPartiallyTrustedCallers attributes.

In case anyone is curious, I think my problem was that I didn't update the web.config file to the latest version.   I wound up switching hosts anyway, just because of the ASP 4.0 and full trust issues with godaddy, but 1.6 will at least run with godaddy.