I opened my iPhoto today to show some video taken 2 months ago and suddenly the files are playing large coloured blocks or stripes. Needless to say my wife is very upset over this as it was important, personal video. It played fine all along. All updates have been done, rebooted the iMac, etc. Seems that video and a few pics of that day are now corrupted. The rest of the iPhoto library appears fine. Any way to repair this? Would going into time machine backup work? If so, what's the best process. What could be causing this? Seems to be only video affected. Please help! 2011 iMac, video was on iPhone5s and iPhoto version 9.5.1 Thanks!