For me it comes and goes. Most of them time, I have no problem. But I was uploading a picture the other day and it got stuck at 25%. I even copied all the text I had already put in my post just in case I lost it, but then the picture started uploading again. Same with viewing others' photos. I'll be going along fine and then one just gets stuck. I'll try closing it out and opening it up again and sometimes it's still stuck, and sometimes it opens.
