playlist xlm only shows names

I need your help! Did the playlist/collection.xml in RB5. Have now installed RB6 on my mac mini and selected import library from version 5. Now I have the playlist on the left in the tab under rekordbox xlm, it only shows me the names there without the tracks being there. How do I do that now so that the tracks are there. Somehow I managed to get my tracks into the collection, they're all there. How do I get the whole thing from the recordbox xlm tab up to the playlist? I also created a rekordbox_bak file in RB5, what do I do with it? Regards Alex