Thanks jmtenny, worked here too.
Or maybe only partially. There is some graphics drawn, but only on the right side of the chart area (as with your example below). If I change the zoom level and hit F5/refresh, the graphics stay in the same place (on the right side), but appear in a different 'one minute' segment (zooming adds or removes segments on the right of the chart).
Also, the 'now','1m',2m','3m',... on the left side never have graphics (in a few minutes of trying).