It's probably being overloaded with pictures from the Star Wars races this weekend. All the runners can use their bib number as a Photopass ID and claim all the pics of themselves from the race courses. (And download them if they've got Memory Maker or an AP with that benefit.)
The app is working better than the website right now, at least for me. I can view all my 5k pics on there but the website won't even let me log in.