Update:
Ok, after playing with this for another hour I finally got it to work!
However, the only way I could get the Shape to ‘close’ (by clicking on the first point, as you might expect) was to actually turn off my Video Track monitoring (so essentially all I could see was my Shape on black).
No matter how zoomed in I was, whenever I tried to replicate this over Video, the Shape would not close, period.
Don’t know if this is a bug, or whether it’s just me, but thought it was worth sharing!
I would have emailed Boris Support with this, but as they only ‘support’ for the first month after purchase I couldn’t…