Forum: RForum too many redirects

Greetings -- I'm getting a "Too many redirects occurred trying to open
“http://<root>/forum/" when going to the top domain of my site.
<root>/user/login work fine.

BTW, when I originally edited site.rb, I've enclosed ActionMailer
settings to :smtp in if RAILS_ENV != 'test' -- that was giving an error,
RForum::RAILS_ENV undefned; then site.rb wouldn't load properly and
default_site was loaded instead!  I guess that needs better exception
management to expose syntax errors in site.rb.