Same issue in my config after latest update.
The same behavior in Firefox browser. MS Edge browser does display a graph but scaled incorrectly.
A (hopefully temporarily) workaround for this: use the Grafana ‘Direct link rendered image’ option found in the Link tab on the Share Panel.
This basically creates a link to a rendered picture of the panel you want by adding ‘render/’ in the url. You can configure the numbers in the ‘&width=1000&height=500’ part of the url to suit your needs.
Of course you will need to remove the ‘&from=1544223600000&to=1544275759966’ part from the url to have it display the time frame you have set for the panel (it will refresh).
You loose the dynamic scalability of the panels though.