Peter,
I sussed it out, for some reason the Face has a copy of the Video V1 media and that is what was causing the “double take”. So, I apply the BFX in Liquid, edit the Effect (opens Boris), add the MS effect to the Video 1 track (delete Video 2 track) AND then turn off the eye on the Face (Track 1) media. I can then adjust as required (still learning finer details) and apply so it renders and goes back to Liquid complete with transparency on the edges about the moving clip.
Thanks for replying Peter, I will be posting more as I learn. I did post an email on the B Support site but have not heard back from them regarding a comment on the User Manual. another story…
Thanks
Alan