Thanks.
I think the issue is that you did not select the form when you applied the progress bar.
Try changing this line of code:
WADFP_SetProgressToForm('submissions_ProgressWrapper', 'submissions_ProgressMessageWrapper', WADFP_Theme_Options['ExtendingWheel:Slate']);
to
WADFP_SetProgressToForm('submissions', 'submissions_ProgressMessageWrapper', WADFP_Theme_Options['ExtendingWheel:Slate']);
the first argument needs to be the form ID.
let me know if you have any further questions.