Consider script name in PathChecker.

devise.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
 
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
   s.authors = ["Jos\303\251 Valim", "Carlos Ant\303\264nio"]
-  s.date = %q{2010-07-04}
+  s.date = %q{2010-07-06}
   s.description = %q{Flexible authentication solution for Rails with Warden}
   s.email = %q{contact@plataformatec.com.br}
   s.extra_rdoc_files = [

lib/devise/path_checker.rb

@@ -3,11 +3,12 @@ class PathChecker
     include Rails.application.routes.url_helpers
 
     def initialize(env, scope)
-      @env, @scope = env, scope
+      @current_path = "/#{env["SCRIPT_NAME"]}/#{env["PATH_INFO"]}".squeeze("/")
+      @scope = scope
     end
 
     def signing_out?
-      @env["PATH_INFO"] == send("destroy_#{@scope}_session_path")
+      @current_path == send("destroy_#{@scope}_session_path")
     end
   end
 end

lib/devise/rails.rb

@@ -20,7 +20,7 @@ class Engine < ::Rails::Engine
       Devise.encryptor ||= begin
         warn "[WARNING] config.encryptor is not set in your config/initializers/devise.rb. " \
           "Devise will then set it to :bcrypt. If you were using the previous default " \
-          "encryptor, please add config.encryptor = :sha1 to your configuration file."
+          "encryptor, please add config.encryptor = :sha1 to your configuration file." if Devise.mailer_sender
         :bcrypt
       end
     end