Ccanning music in traktor doesn't mean you've run them through mixed in key. You need to make sure you've analysed everything in mixed in key, then do a ID tag refresh in traktor for it to show up. And no, I don't use Mashup personally - most people tend to use a more fully featured DAW, such as Ableton, Logic Pro, FL Studio etc. However, you can read more about Mashup here - viewtopic.php?f=12&t=8604 (also moved topic to digital & software - left shadow topic in production)