I had not thought about this but it's a result of the new bfa_postinfo.php
I changed bfa_postinfo.php to use simple Wordpress template tags now instead of the lower-level functions that I had built myself in earlier versions.
Now, with the default Wordpress functions, the default WP behavior (no comments link on single post pages) is being applied as well, leading to the result you describe. The advantage of the new way bfa_postinfo.php is written is that plugins can hook into the post info items and do something with them. Translation/multi-language plugins needs this, for instance.
Since a comment link on a single post page would be a jump to a named anchor on the same page rather than a "real link" it would probably be better accomplished with
At Post/Page Info Items -> FOOTER: Single Post Pages
<a href="#commentform">Write a comment</a>
And right above the jump target, i.e. right above the comment form, in comments.php, add