Related tracks work in 'List' but not 'Master'

Just got Rekordbox 5.2 with DJM-250mk2

Everything cool and working so far but having a problem with the Related Tracks feature. It will work if you select 'List' and show related tracks to the highlighted track in playlist...

Now if I change 'List' to the deck 2 button, it still has the track name on far right but now, no Related Tracks are listed...

Finally if I use the 'Master' deck button it forgets the track completely and still shows no related tracks...

I have tried creating a new 'related tracks' list from scratch - same problem. Is this a glitch or am I just making a noob error?!? It's frustrating as it's an ace feature to have access too!

Thanks

Gary