I have myself, my photos, and a friend pinned to my start. The tiles used to rotate photos, but I forgot my wallet pin, did a reset, and now those tiles don't update (my 'weather view' app tile does update). The photos app has nothing, even though my accounts and albums are there, and myself and my friend just show our static facebook photo.
When you reseted it might have the apps' background tasks turned off which will prevent the live tiles from working.
To fix this:
In your photos app (if not fixed)
If none of this worked