Had the same problem. Searched and found this:
@reclaimthesun Zachary Straub
Just figured my issue out - maybe some of you are experiencing something similar.
It’s really simple actually, I feel silly admitting it - but the width and height of the widget was too large for the containing div I created. When the widget is too large, it won’t show at all, maybe in some cases all that’s needed is to double check the size, especially since some browsers size things differently with margins and padding.
1 year 10 weeks ago reply
That fixed the problem for me, also.