This is way off topic for the LF audience but I've found that some of you guys really know your stuff better than what I would get on a broader forum....
So I have thousands of jpgs created from edited images using Photoshop (all versions dating back, but I've used CS2 for the last two years). When try to upload them to iPhoto, or a flash drive Picture Frame, or Myspace I will often get a "file format not supported". While the exact same file works online on my website or Flickr or other things... it is indeed a jpg.
If I open the problem file with "Preview" and resave, then it loads fine. But that is huge pain in the butt.
I can't imagine I am the only one having this problem. Basically I want to install thousands of family snapshots onto the grandparent's iPhoto and whatnot. And it is embarrassing to be the computer geek who doesn't have an answer.
(And yes, I've repaired the file permissions, done all the updates, and rebuilt the iPhoto libraries.)