When I try to edit an ASPX file with the Design View it freezes for a moment and does nothing, not even an error message.
Looking through menus I've seen some strange things:

* If I go to Tools->Options->HTML Designer it gives me no options on the right panel, just a "Error loading property page" message.
* When I try to open a file using "Open With..." there should be something like "Web Form - Editor", but it is missing and I can only open them using Code View.

I've tried repairing Visual Studio and reinstalling WebDesignerCore, but nothing works. Anyone had the same problem?