Cannot start the application - I've submitted a bug report with the full log.  The error is:

Following errors were detected during this operation.
 * [03/05/2011 1:26:22 PM] System.Deployment.Application.InvalidDeploymentException (HashValidation)
  - File, beep.mp3, has a different computed hash than specified in manifest.
  - Source: System.Deployment
  - Stack trace:
   at System.Deployment.Application.ComponentVerifier.VerifyFileHash(String filePath, Hash hash)
   at System.Deployment.Application.ComponentVerifier.VerifyFileHash(String filePath, HashCollection hashCollection)
   at System.Deployment.Application.ComponentVerifier.VerifyComponents()
   at System.Deployment.Application.DownloadManager.DownloadDependencies(SubscriptionState subState, AssemblyManifest deployManifest, AssemblyManifest appManifest, Uri sourceUriBase, String targetDirectory, String group, IDownloadNotification notification, DownloadOptions options)
   at System.Deployment.Application.ApplicationActivator.DownloadApplication(SubscriptionState subState, ActivationDescription actDesc, Int64 transactionId, TempDirectory& downloadTemp)
   at System.Deployment.Application.ApplicationActivator.InstallApplication(SubscriptionState& subState, ActivationDescription actDesc)
   at System.Deployment.Application.ApplicationActivator.PerformDeploymentActivation(Uri activationUri, Boolean isShortcut, String textualSubId, String deploymentProviderUrlFromExtension, BrowserSettings browserSettings, String& errorPageUrl)
   at System.Deployment.Application.ApplicationActivator.ActivateDeploymentWorker(Object state)