iPhoto slideshow rotates photos wrong by itself!
We have a funeral on Wednesday and have created a slideshow of photos from lots of different people and times in iPhoto on Macbook. When we try to view it in slideshow some photos seem rotated. We've tried manually rotating the photos (so they look 'wrong' in thumnail but 'right' in the slideshow) but it seems it's a temporary fix and next time we go back to this more photos are wrong (different ones!). How do we tell the computer once and for all which way is up for each photo? Help!