If you don't want to wait until GenoPro Inc. resume regular maintenance of the product then a 'cheap and cheerful' hack to fix the Report is to doctor the genomap.svg script to change "D." to whatever you want. e.g. change line 537 of genomap.svg in a Custom skin
from
to replace "D." with "X "
Note that the replacement string length should not be longer than the original if you want to avoid text spilling over any display border.