Photos missing from an ipad sync appear if first modified in iphoto album
Performed a test with 5 photos in an iphoto album. Went to itunes Advanced, selected photos to be shared, selected test album. Quantiy shown was 4. Went back to iphoto album, edited each photo 1 at a time. when the last photo was edited itunes then showed that there were 5 photos in that album.
iMac, OS X Mountain Lion (10.8.2)