Help with Hubigraphs

Does anyone have experience with Hubigraphs? I'm trying to create a Hubigraphs weather radar tile to put in one of my dashboards. I got the oauth key from, downloaded and installed Hubigraphs using Hubitat Package Manager, created a Radar Tile within Hubigraphs and put in my oauth key, even got a cool-looking preview and saved it. I added the device to my Home dashboard.

But when I actually add the tile for that Hubitat radar device, all I get is a blank gray screen. I'm using the "image" tile for this, as that seems to be only one that fits.

What am I doing wrong?

Probably best to post on the main hubigraphs thread, more likely to be seen by the dev (@thomas.c.howard ) and other users of the app.