iTunes keeps re-optimizing photos for iPhone and iPad
I'm not sure when this started, but for a while now, every time I make any sort of change on my iPad or iPhone (adding a podcast, changing a contact, etc.) iTunes decides to re-optimize 78 photos (I don't know why 78, I have hundreds of photos saved), delete them, and then sync them again. This only seems to happen when I change any kind of content to sync to the iPad or iPhone, though I'm not sure if that's really the case and it may be more random than that. It does happen a lot and it is such a waste of time.
I tried deleting the iPod Photo Cache from iPhoto (using Clean My Mac) and it didn't help... In fact I'm wondering if using Clean My Mac is what started this. However I'm also not sure if this started when I got my 3GS and started adding videos on iPhoto, which I do sync to my devices. But the number is always 78 and I have less videos than that, so this doesn't make sense.
Please help if you have any ideas at all... It's a big nuisance and I don't understand why it's happening. Thanks.
Macbook, Mac OS X (10.6.3)