I seem to be unable to create (or comment) on tickets unless I am logged in as a real user. Trac offers a feld "username or email" presumably to allow non-registered users to commnet and/or report errors. If I enter either "rhaas" or "roland" into that field I get:
Trac Error Submission rejected as potential spam
It would be good I believe to let users report errors without having to create an account first.