Ashley
Thanks for replying. I don't think it's the same bug (If it is a bug). It'll let me import them fine. It just has a problem with 22hz, so I'll stick to 44hz.
The issue is where I make a change to an audio track and want to replace an old one already imported into C2. I delete the music from C2, and reimport the new updated file (with the same name).
What seems to be happening is it somehow recalls the old track. I should point out that I am saving my files as CAPX, rather than project. Not sure if this would make a difference.
Still not sure if this is a bug, but it does seem rather unusual. Also not sure why 22hz doesn't appear to be working. That would half my music files sizes :( Probably something I'm doing wrong... :(