I can not find where I can insert a comment in the job. With the older types there was something as 'comment' under form list, but with the DX200 I can't find it.
Comment is still in the Control section of the Inform list on DX200, and should be available in all Language modes (subset/standard/expanded)…
Might sound stupid but have you tried recycling the power on the controller and checking again?
Last resort you could pull a backup and put in your comments with a text editor, (remember you are limited to a string on maximum 32 characters) then reload...