Hi there mate,
Comment Attachment hooks into normal wordpress comment from, if the comment form is done differently – manually, or doesn’t take custom fields into account of course it won’t be visible.
I presume loads of paid themes use their own custom comment form templates, not using correct wordpress hooks. Unfortunately, Comment Attachmetn can’t force itself into your theme files, all it does is tells WordPress “hey, hook me up to the comment form” and then it’s up to the form, to display it and process it – if it’s there.
Regards,
Mart