I installed 3.1 and have the same problem with 3.0 in that when I go to the default page and put in a zipcode (one of the zipcodes in the database) I get a guid error meaning that something is wrong with the services driving the menu.
I removed the service from IIs and recreated the virtual directory in Visual Studio, but that does not fix it. Further, when building the project I get an error in the delivery section:
Error 3 Unable to copy file "obj\Debug\DinnerNow.Restaurants.Delivery.exe" to "bin\Debug\DinnerNow.Restaurants.Delivery.exe". The requested operation cannot be performed on a file with a user-mapped section open.