Thank you for your help.
I changed the 2 lines in the file Text list with box.xaml
<Image x:Name="BoxFrontImage" Aspect="AspectFit" Margin="0,0,0,0" />
<Image x:Name="BoxFrontImage2" Aspect="AspectFit" Margin="0,0,0,0" />
by
<Image Source="{Binding ActiveGame.BoxFrontImage}" />
There is no longer the fading animation but the image takes a little time to appear (100ms)