Yes, I have tried, but I do have to admit that in my first question i forgot to mention that the photos were exported from iPhoto to iPad, then shown on TV via ApppleTV, with a slideshow running on the iPad. The error happened when exporting, so the order in the iPad album wasn't the same as in the iPhoto album. That bug was eventually fixed a few weeks ago, so now I do not have to rename the photos to date and time, just sort them by date taken in iPhoto, and the order in the iPad album is correct, hence the slideshow order running through AppleTV is OK.