Hasta La Motion!

I’ve had difficult time finding literature concerning this topic so any help is greatly appreciated:

I am trying to use the join track function in boujou, but now for some reason instead of getting one white continual track of the two, both tracks disappear. Does any one know why?

I have tried combining feature tracks, target tracks and everything I combine -disappears.

I am using boujou 5 and have not had any issues joining tracks for several months now. So this one perplexes me.

Thanks team.