This code,

driver = Selenium::WebDriver.for(:remote, :url => 'http://slave-tb2.puppetlabs.lan:4444/wd/hub/', :desired_capabilities => :chrome)

Should work to start a webdriver session with chrome... but doesn't. Works as Jenkins user from jenkins.

However,
driver = Selenium::WebDriver.for :chrome

... works just fine.

I raise this because it works "as it should" with :remote .... :firefox.