Ha ha all sorted. I just got an email from Alexey at Pangolin with a screenshot of what you need to do. When you drag a timeline into an empty cue/frame and then you want to drag that cue/frame you've created back into the timeline again. All you do is click on the cue/frame but instead of dragging it actually onto the timeline itself and dropping it in place you drop it onto the timeline tab. It automatically places the cue/frame but you can then drag it into position from there.

Thanks Alexey