When I open a sequence in vixen and press play, everything works fine. The adjustable preview comes up

So I STOP (not pause) the sequence, which makes the adjustable preview window disappear altogether.
I do this because if I want to edit my sequence, I do not see the changes i made being portrayed in the adjustable preview.
Anyway, whenever the preview window disappears, I do not know how to get it back!
I press play again and the preview window doesnt appear at all.
But then after pressing stop, pause, play, loop sequence, play, stop etc... it will randomly start playing the adjustable preview once I hit play.
Anyone know what I'm doing wrong??
THANKS
