Rails - Sep 2010 - controller failing to read flash

I''m seeing some pretty strange behavior from the flash in my rails
2.3.8 app.  I set the flash in a request, and then redirect.  In the
next request (the one redirected to), accessing the flash returns an
empty hash, but the flash is stored and visible in the session.

(rdb:21) session
{:user_credentials=>"...", :session_id=>"...",
:user_credentials_id=>1, :flash=>{:notice=>"Twitter
status updated"}, :_csrf_token=>"..."}
(rdb:21) session[:flash]
{:notice=>"Twitter status updated"}
(rdb:21) flash
{}

Looking at the source for flash in actionpack-2.3.8/lib/
action_controller/flash.rb,
the difference is that the key is stored as a string and not a symbol.
How could that disparity occur?

# Access the contents of the flash. Use
<tt>flash["notice"]</tt> to
        # read a notice you put there or <tt>flash["notice"]
"hello"</tt>
        # to put a new one.
        def flash #:doc:
          if !defined?(@_flash)
            @_flash = session["flash"] || FlashHash.new
            @_flash.sweep
          end

          @_flash
        end


Thanks!

Andrew

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