I got the following error while opening images in Sitecore 7.1 which got migrated from 6.2 to 7.1:
Type 'ASP._Page_sitecore_shell_client_Speak_Layouts_Layouts_Speak_Layout_cshtml' does not inherit from 'System.Web.WebPages.WebPage'.
Can someone please help how to overcome this?
Sitecore 7.1 REQUIRES mvc to be active for SPEAK interfaces, like the image editor in your case. If you do not want MVC active, you should disable SPEAK as well..