@raymond_boniol , the most likely cause of this is that the browser you're using to access Canvas is out of date and not supported. Please compare the version of your Chrome browser with those listed in Which browsers does Canvas support? and if your version is older than the supported versions, update accordingly. It is possible that you'll need to update the OS on the Mac in order to access an update to a supported version of Chrome.
This disucssion post is outdated and has been archived. Please use the Community question forums and official documentation for the most current and accurate information.