I have iOS 8.1.3 and whenever I send/receive a picture,video, or audio message it turns in to a little blank bubble. I can go to details and see it in attachments but never in the conversation itself. Sometimes nothing will show up altogether and just the comment they added to the message shows up but whatever they sent shows up in attachments. It was happening when I had iOS 8.1.2 and continued even when I updated to iOS 8.1.3. It's been like this for a good 3-4 months and I've tried everything. Restarting it, restoring and backing it up, turning iMessage on and off. I don't think there's any setting that does this so I don't know what else to do. I've checked countless forums and no one has the same problem as me.