Key field is blank on my tracks that I have imported from Serato. Don't have another place I could import from easily.

Hi there, the key should be imported directly from the Serato database.

Any chance you can send me your master.sqlite?

Macintosh HD > Users > (your username) > Library* > Application Support > Serato > Library > master.sqlite

*The user Library folder is hidden by default, so you'll need to open a new Finder window, click on 'GO' in the top toolbar, hold down the 'option' key on your keyboard, and then select 'Library' from the drop-down menu.

Actually, scrap that I've found a bug! Thanks :)

Ok, should be fixed now: https://www.mixo.dj/download/MIXO-2.15.0.dmg

You'll just need to import again.

No issues after the update. Done multiple imports!

That's great news, thanks for confirming and happy mixing :)