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I was able to reproduce the problem when the vimeo video is under pagebreak. However, when you move the video to the first page, it loads and work normally as expected. See example: http://form.jotformpro.com/form/42514868653968?
So the issue here is that when vimeo widget is added after pagebreak. I have now raised this to our developers for a resolution.
Thank you for reporting.
We have resolved the issue - the Vimeo widget will now show on the second page of your form (and all consecutive pages)
If you have additional challenges - please let us know.