Javascript not working for Codeception, Yii1 and PhantomJS

I don't get javascript to run in a codeception, WebDriver (PhantomJS) setup for a Yii1 install.

• Codeception (2.1.0-rc1)
• PhantomJS (1.9.7)
• Yii (1.1.14)

Everything is running fine. I can fill in Forms, click stuff etc pp ... BUT javascript is not executed.

Here is my acceptphantom.suite.yml

class_name: AcceptphantomDev
modules:
    enabled:
      - AcceptphantomHelper
      - WebDriver
      - Yii1
    config:
            WebDriver:
                url: 'http://ift.tt/1JRjv4t' # our url base
                host: project.local
                port: 4444
                browser: phantomjs
                window_size: 1024x768
                capabilities:
                      unexpectedAlertBehaviour: ‘accept’
                      javascriptEnabled: true
                      localToRemoteUrlAccessEnabled: true
                      webStorageEnabled: true
            Yii1:
                appPath: '../../www/test.php'
                url: 'http://ift.tt/1JRjv4t'

And I am running the phantomJS Server with:

phantomJS --webdriver=4444

What is also odd is that the screenshots in ./_log are created as empty png files - but that has no priority (just in case that is connected)