Hi there,
I refer you to my blog: https://projectawesome-superwoman.blogspot.co.uk
I made an Instagram slideshow using your widget, following the advice on your guides you have posted on previous users' questions. My IG account is public, and when making my widget the preview showed my slideshow perfectly.
However, after adding the html/javascript widget, the slideshow isn't appearing in my sidebar. You can see the heading for the widget, but nothing appears underneath. I even checked the widths of the slideshow to make sure it would fit in the sidebar, and it should be fine. I can't see any reason why this shouldn't work.
For reference, this is the html code as copied from your customization page:
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