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When tried to create Fillable PDF form from your form http://www.jotformeu.com/form/60433422326345 "Working" message was loading and loading and Fillable PDF form was never created. I was also able to replicate mentioned issue on my cloned form.
I will escalate this issue to our developers and we will inform you via this thread once this issue is resolved.
If you have issue with some other form, please provide us ID of that form.
Apologize for the inconvenience, you should be able to download your PDF form now. Thanks for your cooperation.