Rails - May 2008 - conditional action caching/memcache - not working with all actions (routes?)

I''ve been trying to track this down for a while now and have yet find
the solution...this problem appears only to occur in production
environment with multiple mongrels.

We''ve got several controllers using conditional action caching using
cache_fu plugin. Some actions work great, as I expect, others seem to
work intermittently at mongrel startup, but quit working after a
while.

So for example, the index action in a help controller works fine (this
is picked up by a default route):

class HelpController < ApplicationController
  caches_action :index =>  {:ttl => 1.hour, :if => :cacheable?}

  def index
  end
end


However, some actions, including the main site index action seems to
fail miserably.

Uses this route:

 # Default welcome Route
map.home '''',    :controller => "home"

# Note - c.flash_message below is to pick up redirects to index page
with flash messages like one one logout, which will have a flash
message ("You are now logged out," etc.)

class HomeController < ApplicationController
  before_filter :login_required, :except =>
[:index, :welcome, :public_profile, :test]
  before_filter :find_account_or_redirect, :except =>
[:index, :welcome, :public_profile, :test]
  caches_action :index => { :ttl => 30.minutes, :if
=> :cacheable? } , :cache_path => Proc.new {|c| c.flash_message }

  def index
    respond_to do |format|
      format.html do
        unless logged_in?
          @favorite = FeatureItem.recent_favorites(1,
''entertainment'')
[0]
          @favorites = FeatureItem.recent_favorites(10,
''entertainment'')
          render :action => ''welcome'' and return false
        end
        .
        .
        .
      end
    end
  end
  .
  .
  .
end

cacheable? method is in application controller (logged_in? is in
restful_authentication library)

  def cacheable?
    logged_in? ? false : true
  end

About four of the actions are working perfectly, the other four or so
fail. Any insight would be highly appreciated...
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