ALWAYS use Synchronize with Central (SwC) immediately after loading new families or types (or duplicating system family types). Don't place any instances until you have!
This post is tagging on two earlier posts on the subject of loading content, restating the punch line to emphasize it on its own. If you're inclined to just take my advice just reread the first two sentences and behave accordingly. If you're a bit curious, need more convincing, you can read the FIRST and SECOND posts for more background info.