Yeah. Go to the VS Command Prompt and type in gacutil /cdl
Make sure all IE windows are closed prior to running utility. Otherwise, it will fail since an IE instance will have an object in the object cache loaded in memory...
If that doesn't work... Add C9 to your trusted sites collection and see what happens.
All windows closed, went to VS command prompt and type. The download cache deleted successfully. Reopened and tried again: no change.
Added http://channel9.msdn.com/ to trusted sites and tried again: no change, still redirects. The only site in my trusted zone is c9.
Any other suggestions?