AnonymousUser class not found by plugin
Because the AnonymousUser class is in app/models/user.rb, plugins like http://www.redmine.org/plugins/anonymous-authors can't autoload it. The temporary solution I used was to add
autoload :AnonymousUser, "/full/path/to/redmine/app/models/user.rb" to the plugin init.rb.
I think the correct solution would be to break AnonymousUser into its own file.