Below are the steps for working with a post that work for me:
1. Open a project based on CTP5
2.IN Explorer Explorer, turn on "Show all files"
3. Open the "bin" folder and delete "Microsoft.Web.Mvc.dll", "System.Web.Mvc.dll", "System.Web.Abstractions.dll", "System.Web.Routing.dll"
4. Open the "Links" folder, click "ERROR" in the "System.Web.Abstractions" window and in the "Properties" window change "Copy local" to "true". Repeat the same with System.Web.Routing.
Appendix 5.Build (Ctrl + Shift + B)
6. Open site.master in the designer. VS will not work.
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