When I sync my iPad, many times an app I've downloaded to the device will be removed. I have the "sync new apps" option selected in iTunes but it doesn't seem to matter. This happened on my old windows pc as well as my new iMac. I can sync the app by finding it in the app menu on iTunes and checking the box. I have never had this problem with my iPods and iPhones. Both iTunes and the ipad are running the latest versions. What am I doing wrong?