Newsblur can’t seem to fetch/parse the Atom feed at https://utcc.utoronto.ca/~cks/space/blog/?atom. On the website it just results in the error message “There was a problem fetching the feed from this URL.”
Weirdly enough the URL in the “Fix a misbehaving site” dialog then sometimes gets truncated to just the base domain name, which obviously doesn’t work either.
According to the validator at https://validator.w3.org/feed/check.cgi?url=https%3A%2F%2Futcc.utoronto.ca%2F%7Ecks%2Fspace%2Fblog%2… the feed should be OK.