I have a project which requires an image in the window. This is a static image and i added through \'Add>Existing Item\'. It exists in the root of the project.
I re
I had a similar problem. After I deleted a someStyle.xaml file that I wasn't really using from the solution explorer. 
Then I restored the file, but no change happened. Cleaning and rebuilding the project did not help. 
Simply deleting the corresponding row:
<ResourceDictionary Source="someStyle.xaml"/> 
did the trick.
I had the same issue. Cleaning and rebuilding the solution didn't fix it so I restarted visual studio and it did. Here's hoping Visual 2010 fixes this issue and the many others that plauge wpf in Visual 2008.
→ Right click the image file → Click property → Select Build Action to Resource → Clean and Build solution → Run the Solution
You will get the all.
Try starting the path to your image with a "/":
<Image Source="/bug.png"/>
                                                                        Example of async load, another option. Example clip.mp4 is in the web project root.
void Landing_Loaded(object sender, RoutedEventArgs e)
{
    //Load video async
    Uri pageUri = HtmlPage.Document.DocumentUri;
    Uri videoUri = new UriBuilder(pageUri.Scheme, pageUri.Host, pageUri.Port, "clip.mp4").Uri;           
    WebClient webClient = new WebClient();
    webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
    webClient.OpenReadAsync(videoUri);
}
void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
    byte[] VideoBuffer = new byte[e.Result.Length];
    e.Result.Read(VideoBuffer, 0, (int)e.Result.Length);
    MemoryStream videoStream = new MemoryStream(VideoBuffer);
    ContentVideo.SetSource(videoStream);
    ContentVideo.Stop();
    ContentVideo.Play();
}
                                                                        It doesn't, or at least the current beta doesn't. I found this page while looking into exactly the same problem. Rebuild/clean did nothing. After closing down and reloading the solution the file magically became compatible again.