Well, Torrent Collection is entirely different from Torrent Share. You need to get your facts straight.
Torrents which appear in Torrent Collection are not present on your machine but on the machines of other BitComet peers.
Therefore, as kluelos already explained to you, your client needs to download first the .torrent file for that torrent, before knowing which files are contained in it and being able to start downloading.
This .torrent file is downloaded from other BitComet peers, if available. Your client initiates a search through the DHT Network asking other peers if they have the .torrent file for that torrent. If it finds it quickly it will download it in a jiffy and you may not even notice that operation at all; you’ll be immediately presented with the standard properties dialog, where you can see all the files of the torrent and everything.
But if it doesn’t find the .torrent file quickly (i.e. the peer which supplied the hash for that torrent isn’t online anymore and others haven’t responded yet) or it doesn’t find it at all, you’ll be stuck with the dialog that you see now; since your client doesn’t have the .torrent file yet, it doesn’t know what files it contains.
So what you see is normal, the yellow color of the icon means that your client is trying to download a .torrent file for that task at present time.
If it succeeds, it’ll become green and you’ll see the normal dialog. If not it may stay yellow until it finds the .torrent file for that task.
If you don’t want to wait just hit the “Download Now” or “Download Later” button, as soon as the .torrent file finished downloading, your task will become a normal one and will either start downloading or will just wait for you to start it, depending on your above choice.
If you hit “Cancel” the client will still try to download the .torrent file, and once it succeeds you’ll see a blue checkmark icon for that torrent and you’ll be able to find it in Torrent History.