I had an issue the other day where a couple of my Aperture photo albums weren’t appearing in the photos tab of iTunes, so I couldn’t sync them to my iPad. The fix turned out to be: select the errant photos in Aperture and then click on the menu item “Photos > Generate Thumbnails”. Some people recommend “Photos > Update Previews” as well, but it wasn’t required in my case.
Chris Parker's Personal Blog – Flying, sailing and photography, mostly. And gadgets.