weird. i never received any copy of my comments.. nor about following ones, but then there might not have been any in a span of 24h. we're talking about the upload pages, right? not the forum.
btw, i'm talking from the perspective of a downloader, not uploader.
and i didn't find anything related i could check/uncheck in my profile as to which notifications i get. but your reply and the artists' uploads i follow did generate notification emails, and i had mail exchanges with members too..
what i do now, if i want to see if a comment i've made had been answered, is to check regularly on the page - which of course generates nonsense page viewings ~