Missing Intellisense in VS 2015 RC for Xaml - xaml

Having been quite spoilt by this excellent add on for VS 2013, it has come of something of a shock to find that there is absolutely no Xaml intellisense when using vs 2015 RC.
in the options I have made sure that it is selected:
and that the designer is used as the default when editing my views;
I have started and restarted Visual Studio several times and yet intellisense remains stubbornly inactive when creating Xaml ( NB it is fine when writing either VB or C# code).
Has anyone else experienced this and found a solution?. Visual Studio 2013 is still on my machine, but the two should work happily side by side, indeed my experience is that they do bar this little matter of no intellisense for xaml.
Thanks

Uncheck Enable XAML designer, restart VS; then check Enable XAML designer again and restart VS again, the Intellisense comes out. This works for me. :)

I also experienced this and my solution was to reset the environment settings using the Import and Export Wizard. Tools->Import and Export Settings. And then clicking on "Reset all settings".

Deleting the .suo file and restarting Visual Studio (20015 rc) solved this for me.

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Visual studio 2017 showing Errors for Blazor but compiles

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When I start a new Blazor fullstack project from Visual Studio it shows error in IDE. I have looked at Visual Studio displaying errors even if projects build but doesn't seem to help.
I followed the guide on Blazor (https://blazor.net/docs/get-started.html)
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and more details:
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I'm facing performance issues when editing xaml files (views, styles, app.xaml, ...) in Visual Studio 2015.
If a xaml file is open I got a really nasty delay when typing or scrolling, even in other files. Also my CPU goes up and IntelliSense is not loaded. When I close all xaml files then everything just go back to normal performance, also in other files like .cs or .resw.
After a while I got an error that say "An exception has been encounterd. This may be caused by an extenstion". And yes, I've looked in the ActivityLog.xml file, but I couldn't figure it out. There where 2 errors, 1 with a source of "ClientRights (Client rights determined)" and 1 with "Editor or Editor Extension (System.NullReferenceException)"
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Disable CodeLens (Options > Text Editor > All languages - uncheck "Enable CodeLens")
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