Hi,
Is the "Change Field Mapping and conversion rules" screen coming as blank by default? If so, go to the first step in change mode, go to process recording screen and click on "default all" and then save.
Now, proceed as in normal case and check whether the recorded fields are appearing in step 5.
If its showing the source fields, try auto field mapping with "match fields with similar names" option.
Regards,
AKPT