I have a form that I went to switch from Enketo to WF and on load received the following error
An error occurred while loading this form
The function 'distance' received a value that does not represent GPS coordinates
The field with the function had a calculation as
round(distance(${line_trace}),2)
Adding a trigger to the field as ${line_trace} allowed the form to load, but I guess it would be preferable if the form didn't fail on load if distance evaluates on a blank field. Not sure if this is already resolved with other changes for v1.0.3