огурец, капибара и селен работают случайным образом

Установка с огурцом, капибарой и селеном, но некоторыми сценариями работает только случайным образом.
Выполнение
рубиновые 1.8.6 на rvm
направляющие 2.3.8
селен выталкивает открытый firefox 3.6

Я попытался добавить это без удачи:

with_scope(selector) do
  click_button(button)
  selenium.wait_for_page_to_load
end

Вывод ошибок иногда:

>  Given I am logged in and have created newsletter and subscribers                           # features/step_definitions/newsletter_send_steps.rb:108
      end of file reached (EOFError)
      /Users/christianhager/.rvm/rubies/ruby-1.8.6-p399/lib/ruby/1.8/net/protocol.rb:133:in `sysread'
      /Users/christianhager/.rvm/rubies/ruby-1.8.6-p399/lib/ruby/1.8/net/protocol.rb:133:in `rbuf_fill'
      /Users/christianhager/.rvm/rubies/ruby-1.8.6-p399/lib/ruby/1.8/timeout.rb:62:in `timeout'
      /Users/christianhager/.rvm/rubies/ruby-1.8.6-p399/lib/ruby/1.8/timeout.rb:93:in `timeout'
      /Users/christianhager/.rvm/rubies/ruby-1.8.6-p399/lib/ruby/1.8/net/protocol.rb:132:in `rbuf_fill'
      /Users/christianhager/.rvm/rubies/ruby-1.8.6-p399/lib/ruby/1.8/net/protocol.rb:116:in `readuntil'
      /Users/christianhager/.rvm/rubies/ruby-1.8.6-p399/lib/ruby/1.8/net/protocol.rb:126:in `readline'
      /Users/christianhager/.rvm/rubies/ruby-1.8.6-p399/lib/ruby/1.8/net/http.rb:2020:in `read_status_line'
      /Users/christianhager/.rvm/rubies/ruby-1.8.6-p399/lib/ruby/1.8/net/http.rb:2009:in `read_new'
      /Users/christianhager/.rvm/rubies/ruby-1.8.6-p399/lib/ruby/1.8/net/http.rb:1050:in `request_without_fakeweb'
      /Users/christianhager/.rvm/rubies/ruby-1.8.6-p399/lib/ruby/1.8/net/http.rb:1037:in `request_without_fakeweb'
      /Users/christianhager/.rvm/rubies/ruby-1.8.6-p399/lib/ruby/1.8/net/http.rb:543:in `start'
      /Users/christianhager/.rvm/rubies/ruby-1.8.6-p399/lib/ruby/1.8/net/http.rb:1035:in `request_without_fakeweb'
      ./features/step_definitions/web_steps.rb:24:in `__instance_exec2'
      ./features/step_definitions/web_steps.rb:9:in `with_scope'
      ./features/step_definitions/web_steps.rb:9:in `with_scope'
      ./features/step_definitions/web_steps.rb:23:in `/^(?:|I )press "([^\"]*)"(?: within "([^\"]*)")?$/'
      features/enhanced/newsletter_send1.feature:7:in `Given I am logged in and have created newsletter and subscribers'

И othertimes:

> no button with value or id or text 'create_user_button' found (Capybara::ElementNotFound)
      ./features/step_definitions/web_steps.rb:24:in `__instance_exec2'
      ./features/step_definitions/web_steps.rb:9:in `with_scope'
      ./features/step_definitions/web_steps.rb:9:in `with_scope'
      ./features/step_definitions/web_steps.rb:23:in `/^(?:|I )press "([^\"]*)"(?: within "([^\"]*)")?$/'
      features/enhanced/newsletter_send1.feature:7:in `Given I am logged in and have created newsletter and subscribers'

И иногда это просто работает....

Это - то, как мой env.rb похож

ENV["RAILS_ENV"] ||= "cucumber"
require File.expand_path(File.dirname(__FILE__) + '/../../config/environment')

require 'cucumber/formatter/unicode' # Remove this line if you don't want Cucumber Unicode support
require 'cucumber/rails/world'
require 'cucumber/rails/active_record'
require 'cucumber/web/tableish'
require 'capybara/rails'
require 'capybara/cucumber'
require 'capybara/session'
require 'cucumber/rails/capybara_javascript_emulation' 
require "selenium-webdriver"

Capybara.default_driver = :selenium
Capybara.default_wait_time = 5 
Capybara.ignore_hidden_elements = false
Capybara.default_selector = :css

ActionController::Base.allow_rescue = false

require 'database_cleaner'
DatabaseCleaner.strategy = :truncation

Before do
 Capybara.reset_sessions!
 DatabaseCleaner.clean
end

Cucumber::Rails::World.use_transactional_fixtures = false

Огуречные шаги:
Учитывая я нахожусь на странице регистрации
И я заполняю "user_login" с "jeppsipeppsi@arcticelvis.com" в "теле"
И я заполняю "user_password" с "секретом" в "теле"
И я заполняю "user_password_confirmation" с "секретом" в "теле"
И я проверяю "terms_of_use" в "теле"
И я нажимаю "create_user_button" в "теле"

Любое понимание было бы большим :)