Edgent console on a Raspberry Pi doesn't render properly on the Pi

In trying to reproduce EDGENT-249 I encountered the following instead.

I started a trivial poll -> filter -> print DevelopmentProvider topology on the Pi.

A browser on OSX pointed at the console's port on the Pi works great; everything renders fine.

Several things didn't render properly with the browser on the Pi.

While the "streams" rendered in their grey fat line and hovers on different parts of it worked, the colored oplet circles, the "metric oplet" squares, and oplet number labeling are missing. And the entire "Metrics" bottom half of the page is missing.