Visual Studio 2015 Designer Crashes in all Win10 UAP projects ("The app didn't start.")
<p>The xaml visual designer crashes for all WIN10 UWP projects, including ones created from the standard template with no code added. I don't know when it started because I thought it was a problem with my project until I tried creating some new ones.  The error is given below and in the screen shot at the bottom.</p>

<pre><code>System.Runtime.InteropServices.COMException
The app didn't start. (Exception from HRESULT: 0x8027025B)
   at Microsoft.VisualStudio.DesignTools.HostUtility.AppPackage.AppPackageNativeMethods.IApplicationActivationManager.ActivateApplication(String appUserModelId, String activationContext, ActivateOptions options, Int32&amp; processId)
   at Microsoft.VisualStudio.DesignTools.HostUtility.AppPackage.DesignerWrtUtility.ActivateApplication(String appUserModelId, String activationContext, Object site, Boolean isRunningElevated)
   at Microsoft.VisualStudio.DesignTools.HostUtility.Platform.AppContainerProcessDomainFactory.ActivateApplicationInternal(String appUserModelId, String activationContext, Object site)
   at Microsoft.VisualStudio.DesignTools.HostUtility.Platform.AppContainerProcessDomainFactory.CreateDesignerProcess(String applicationPath, String clientPort, Uri hostUri, IDictionary environmentVariables, Int32&amp; processId, Object&amp; processData)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Primitives.ProcessDomainFactory.ProcessIsolationDomain..ctor(ProcessDomainFactory factory, IIsolationBoundary boundary, AppDomainSetup appDomainInfo, IIsolationTarget isolationTarget, String baseDirectory)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Primitives.ProcessDomainFactory.CreateIsolationDomain(IIsolationBoundary boundary)
   at Microsoft.VisualStudio.DesignTools.HostUtility.Platform.AppContainerProcessDomainFactory.CreateIsolationDomain(IIsolationBoundary boundary)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Primitives.IsolationBoundary.Initialize()
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Primitives.IsolationBoundary.CreateInstance[T](Type type)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolatedObjectFactory.Initialize()
   at Microsoft.VisualStudio.DesignTools.DesignerHost.Services.VSIsolationService.CreateObjectFactory(IIsolationTarget isolationTarget, IObjectCatalog catalog)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolationService.CreateLease(IIsolationTarget isolationTarget)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolationService.CreateLease(IIsolationTarget isolationTarget)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.IsolatedDesignerService.CreateLease(IIsolationTarget isolationTarget, CancellationToken cancelToken, DesignerServiceEntry&amp; entry, IServiceProvider serviceOverrides)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.IsolatedDesignerService.IsolatedDesignerView.CreateDesignerViewInfo(CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolatedTaskScheduler.InvokeWithCulture[T](CultureInfo culture, Func`2 func, CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolatedTaskScheduler.&lt;&gt;c__DisplayClass10_0`1.&lt;StartTask&gt;b__0()
   at System.Threading.Tasks.Task`1.InnerInvoke()
   at System.Threading.Tasks.Task.Execute()
</code></pre>

<p>I have tried  the following:</p>

<ul>
<li>Running as administrator</li>
<li>Disabling Project Code </li>
<li>Clearing the \Designer\ShadowCache folder</li>
<li>Adding read permissions to the HKEY_CLASSES_ROOT for All Application Packagesas well as C:\Windows.</li>
<li>Running the visual studio repair.</li>
<li>I am not using TrueCrypt (people with similar issues were)</li>
<li>I have tried changing the platform target to ARM, x64 and x86 (rebuilding and reloading after each)</li>
</ul>

<p>None of these have fixed the issue. I get the same error in blend. Any ideas?</p>

<p><a href="https://i.stack.imgur.com/9Zfde.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9Zfde.jpg" alt="Error Message Screenshot"></a></p>