After upgrading to .57.2 the icons in yweather for ‘Home Weather’ are blank. Not sure what to check for this. Had no issues like this until upgrading. I am using Hass.io also. Attached a screenshot below.
Just in case, have you emptied the browser cache and done a forced refresh of the page? That often fixes odd display problems after an upgrade.
It is happening on all devices even a new one, but I’ll try now for a sanity check.
Brand new machine in a browser never used to access Hass shows the same error.
Any update to this? I Just noticed this on HA 0.58.0. I am missing the icons for
- sensor.today_condition and
- sensor.today_current
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Same problem with Yahoo Weather meteo icons… 
Still showing this issue on .58.1
I noted the same things happened with icon for my mobile phone, set in known_devices.yaml
The png images was stored in my hosting space, and I have specified the external link. After update this disappeared also with the yahoo weather icon.
After this i move the device icon locally on raspberry (folder www) and it reappears.
So i think this is problem for external sored image! But I can’t find a solution… 
I am also having missing and broken images. I have an automation setup that sends a message when the current condition changes and it is showing broken images… When I try to open the image from the link sent in the automation, I get an error. Here is an example:
https://l.yimg.com/a/i/us/we/52/27.gif
Perhaps something changed with Yahoo! and nothing is broken with HA.
Awesome news, it seems to be fixed in the next version:) https://github.com/home-assistant/home-assistant/issues/11120