For years we had subtle bugs with commenting and filling. That got fixed, but now comment-start is nil.
Perhaps this is related: commit 94dd2e52439aba488dbac18bd888efb96ede417c Author: Nicolas Goaziou <n.goaz...@gmail.com> Date: Sun Jul 29 00:05:33 2012 +0200 Rewrite filling functions * lisp/org.el (org-fill-context-prefix): New function. (org-fill-paragraph, org-auto-fill-function): Use new function. Also handle comments. (org-adaptive-fill-function): Remove function. (org-get-local-variables, orgstruct++-mode): Don't store now unused adaptive-fill* functions. Thanks. Samuel -- The Kafka Pandemic: http://thekafkapandemic.blogspot.com