I have tons of pictures in a fairly large iPhoto library. This is the same iPhoto library that originated from probably 2005 or so, and has been upgraded over the years with the various versions of iPhoto that have brought Events, Faces, Places, and so on. I just did a fresh reinstall of Mountain Lion, and am liking the 'new start' approach. All my media is in its appropriate place in iTunes rather than being spread across the different ways that Apple has changed it over the years, and so on. I'm wondering if I should re-import all of my photos into iPhoto and get a fresh start there, as well? I've had occasional problems over the years, especially with me having tagged faces and those tags somehow going missing. The library itself seems to be in a different format. It's called "iPhoto Library" of course, but when I copied and pasted it from my external hard drive, it didn't ask to replace the brand-new, no pictures 'iPhoto Library.' It's actually putting a second iPhoto Library file in there. Long story short, what do you think? Time to reimport all my photos? I know the biggest issue is that I'd have to re-tag them all with faces, but if that gives me a more stable library it may be worth it.