Go to chrome://plugins and check “Always Allowed” under the Flash plugin (this is Chrome's built-in flash plugin, Pepperflash)
If you have more than one Flash plugin installed, please disable one version by going to chrome://plugins, click on “Details” in the upper right corner, and “disable” under one of the two Flash plugins
Load the content in Incognito mode (menu>new Incognito tab) to see if there is any improvement
Try to reset your Chrome browser settings
If that doesn't work, try disabling Pepper flash (built-in plugin) and enabling the standalone version of Adobe Flash.
Try turning off the hardware acceleration. Menu > Settings > go to Advanced Settings and look under 'System' for the options below, and uncheck "Use hardware acceleration when available."