IPad & iPhone Sync problems

This is starting to make a hole in my head!
I have one album that doesn't want to sync with my iPhone. I tried repairing the database - no joy. Then I tried rebuilding the database - even less joy (since it deleted all the images from 2 of my albums and I had to replace those.)
Every time I would try to sync to the iPhone, I would get a -50 error. Meanwhile, syncing the same album to AppleTV worked fine.
OK, I decided this was probably due to a problem with a single photo. So I muddled through testing, and found 4 photos that were preventing the sync. I removed those 4 photos, and it was able to sync with the iPhone.
But then I tried to sync the same album to my iPad, and the -50 error is back. When I get some time, I'll try to track down the additional images that might be causing it for the iPad.
But this leaves me frustrated and confused:
1) Why would the same album sync fine to AppleTV, but have a problem syncing to iPhone and iPad?
2) Why would different photos be causing the same error on different devices?
3) Why is this only an issue for photos in that 1 album?
4) What would cause individual images not to sync?
BTW - to fix the problem with the individual images, I duplicated the master for those files. I then lifted/stamped the adjustments. The new image was able to sync just fine.
Any suggestions?

Well, after hours of troubleshooting, I think I figured out the problem.
First, the fix:
Select all images in the "offending" album.
While holding down the "Option" key, click right and select "Generate Previews".
Then re-sync, and it works.
My theory on why this works:
I suspect there was no problem with the Aperture Library. I believe the problem was with the iTunes Optimized Image Cache - you know, when iTunes says "Optimizing xx of yy images for iPad". That cache, I believe, is only updated when there is a change to the image. I'm also guessing that deleting the image from the device (iPad or iPhone) does not delete the image from the cache, so if you then re-add it to the device, it pulls it from the cache. So the only way to re-generate the cached image is to make a change to the image. This can be accomplished by making additional adjustments to the image. But of course, no one wants to do that. So instead, another way to update the timestamp on the image is to regenerate the preview. When iTunes sees the update to the timestamp, it goes ahead and runs its "Optimizing..." task, recreating the cached image that gets dumped onto the iPad or iPhone.
So, I believe this is actually a bug in iTunes.

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