It is just the flickr data provider that is built into it is broken, I guess because it still uses http for flickr, but the rest of it still works so it still works in the image gallery, as long as it works we will keep it, but we will remove the broken Flickr Slideshow.
In general, silverlight is kind of deprecated and out of style for web applications and I don't expect to add any new silverlight things into mojoPortal going forward, it is better to use html 5 and javascript.
Thanks for the beer!
Cheers,
Joe