FormWizard was recently installed on Wikidata and whilst it does work in userspace it does not work in Wikidata: space, all that happens is a stalled progress bar comes up.
According to this .js file for the gadget, FormWizard is permitted to operate in the Wikidata: namespace
The config file for the non working form is at:
A practice config file in userspace which does work is at:
@I_JethroBT can provide more information
(assigning to Lydia as she kindly offered to take a look)