A shortcut to pasting things is Ctrl+V, now, your problem is not uncommon, it happens with quite a few people where the markings or items won't show up. What I can only suggest to you is re-downloading them. I can provide you with a download to MM3, but i'm not sure which items you have. I personally have VERY many which I could also pack up for you to download. If you /are/ going to re=download then just PM me and i'll PM you back with download links.
