The complaints do not make sense. The iOS 4.3.3 update was a fix for a minor issue that the media blew way out of proportion. It has nothing to do with any issue of files being erased. What would make sense since this apparently affects two iPads connected to the same computer, is that the computer might have a virus. The other possibility is that the iPads were synced to a computer other than the one they were originally synced with. If they were not backed up before syncing to a new computer, iTunes would erase the iPads.