That does help actually. What that shows is that it is trying to view the older version of the API explorer that was using the .attask-ondemand.com domains from before we finally deprecated them in the 19.2 release. To get past this you will likely have to clear your cache for at least this page. A ...

Philippe, Can you let me know what error you are receiving in Chrome, also perhaps post a screenshot? Brad Littler Support Program Manager Workfront