New Post: AccessViolationException when accessing pixel color (GetPixel())

Hi,

I'm using WriteableBitmapEx to edit an image taken with tablet's cam with Windows 8 Pro but I got an AccessViolationException every time I try to get a pixel color value, here's the code:

Windows.Media.Capture.MediaCapture captureMgr = new MediaCapture();
await captureMgr.InitializeAsync();

IRandomAccessStream memoryStream = new InMemoryRandomAccessStream();
await captureMgr.CapturePhotoToStreamAsync(imageProperties, memoryStream);
await memoryStream.FlushAsync();
memoryStream.Seek(0);

WriteableBitmap tmpImage = new WriteableBitmap(1, 1); 
tmpImage.SetSource(memoryStream);
tmpImage.GetPixel(1, 1); // An AccessViolationException occurs.

What I'm doing wrong? Or maybe a library bug?