Uff I don't know how to explain my problem... I'll try to be clearer as possible...

So... the situasion is the following...
I have a MainPage.xaml and a ChoosenPhoto.xaml

In MainPage I choose an image from the media library using the PhotoChooserTask and then I redirect to ChoosenPhoto. In ChoosenPhoto I apply a filter to the photo and I show It...
No problem.
I click back button and i do the same action!
The filter is applied to top half photo and the bottom half is not shown (or better, the bottom half is shown of just one color, grey, beige.. depend from the filter applied)..

I think it could be the cache of the image (perhaps the preceding image could create some problem?).. I have tried to set the source of the image = null, and then to set the source to the stream of the new chosen image.

What could be? thanx...