Some Photos Blacked Out

This indicates a disconnect between the Thumbnail and the original

this can be caused by two things

1 - User action deleting items from inside the iPhoto library - can be directly - can be from the All images list (never delete from there) - can be from running cleanup software like MacKeeer, CleanMac2 or other dangerous, defective software that improperly deletes or changes things in the iPhoto library - if you have done any of these things you must restore your backup from before you did them and damaged your iPhoto library - and I recommend getting rid of any "clean up software" ASAP (although being essentially MalWear it is not easy)

2 - corruption of the iPhoto library - If it is not #1 then Back up your iPhoto library, Depress and hold the option (alt) and command keys and launch iPhoto - rebuild your database

LN

No, only if the Repair database (#4) doesn't do the job. I'd do them in this order: #4, #1 and then #2 (only if you're having thumbnail problems).

I'm really hoping Photos is a good program. Seems people have been none too happy with some of the iLife apps lately like iMovie, iPhoto. Getting a lot of negative feedback.

Those reviews aren't worth the paper they're not written on.

The problems with them are manifold: for a start, happy people are less likely to review, unhappy happy are much more inclined to. That's why we don't have thousands and thousands of posts on this forum from all the people who have no problems saying "look I have no problems". Unhappy people get cross and are more likely to express that anger in negative reviews.

Then what about the reviewer? What is his or her knowledge, experience and skill level? No doubt they are having problems, and real ones, but how do you know if their issues are problems with the app, their own inexperience, third party conflicts and so on. I've seen people on here claim the fact that iPhoto won't edit video is a bug. I've seen hundreds and hundreds of posts from folks on here who are certain they've found a bug, only for their glitch to be resolved. No review is worth anything unless you know something of the reviewer, his or her knowledge and experience.

So frankly, I never bother with those reviews on any such stores, not just iPhoto on the Mac App Store. And here's a solid prediction: when Photos is released there will be a storm of negative feedback. There always is.

I'm really hoping Photos is a good program. Seems people have been none too happy with some of the iLife apps lately like iMovie, iPhoto. Getting a lot of negative feedback.

As Terence has already pointed out that's not a reliable source. It's like judging the health of a city by visiting the Emergency Room of one of it's busiest hospitals.

Then what about the reviewer? What is his or her knowledge, experience and skill level? No doubt they are having problems, and real ones, but how do you know if their issues are problems with the app, their own inexperience, third party conflicts and so on. I've seen people on here claim the fact that iPhoto won't edit video is a bug. I've seen hundreds and hundreds of posts from folks on here who are certain they've found a bug, only for their glitch to be resolved. No review is worth anything unless you know something of the reviewer, his or her knowledge and experience.

All that tells you is that there are 500 people unhappy, but tells you nothing at all about why they are unhappy.

Does it? what issues does it tell you about?

but when you start closing in on 500 reviews with a 2 star total..

Out of how many? Over 100 million Macs were sold between 2003 and 2013. So 500 out of 100,000,000 or 5 out of 1,000,000 is only 0.05%. Not very many is it? And if you want to assume only 1/2 of those are using iPhoto make that 0.1%.