Steps to reproduce:

1. upgrade to 4.0.9
2. open any map with chrome
3. notice that map is completely missing, see screenshot
4. try the same with firefox and it works

Result:
See screenshot...

there is a java script error about ED being undefined

jsLoader.php?lang=en_GB&ver=4.0.9&showGuiMessaging=1:19972 Uncaught ReferenceError: ED is not defined
    at HTMLDocument.<anonymous> (jsLoader.php?lang=en_GB&ver=4.0.9&showGuiMessaging=1:19972)
    at fire (jsLoader.php?lang=en_GB&ver=4.0.9&showGuiMessaging=1:8208)
    at Object.fireWith [as resolveWith] (jsLoader.php?lang=en_GB&ver=4.0.9&showGuiMessaging=1:8338)
    at Function.ready (jsLoader.php?lang=en_GB&ver=4.0.9&showGuiMessaging=1:8558)
    at HTMLDocument.completed (jsLoader.php?lang=en_GB&ver=4.0.9&showGuiMessaging=1:8593)

Expected:
a working map displayed just like on firefox