In order to continue playing Zynga Poker on the Chrome Browser Version 55, you need to enable Adobe Flash Player on the browser.
Here are the steps to enable Adobe Flash Player on Chrome Browser Version 55:
Open up Zynga Poker using your Chrome Browser, Version 55 and Click the “LOCK” Icon found on the left side of the address bar.
Find the “FLASH” option from the list of site settings
Click the “Allow” option on the FLASH settings and choose “Always allow on this site” from the drop down menu.
Reload the page and start winning some chips!