After updating to 0.62.0, I can get the front end of HA to show and things more or less work. However, the Hassio tab when clicked gives me the “sad page” icon and this error message: “The webpage at https://[redacted].duckdns.org/api/hassio/app-es5/index.html might be temporarily down or it may have moved permanently to a new web address.”
Can you reload it? Mine doesn’t like to pop up on the first try, (no “sad page”) but a browser page reload will bring it up.
I did experience the “sad page” on everything earlier today. I first tried to go to the info page, and the log wouldn’t load. Then I tried to go to the configuration page and had the “sad page”. “Sad page” on the overview as well. I thought the networking functionality had locked up, but surprisingly, I could Putty in and was able to restart the server. Everything was fine after that.
I had the same issue, try to remove your password from the config.yaml file.
http:
# api_password: !secret http_password
This worked for me but i need to access Home Assistant from external (as it seems you do as well) so i downgraded and added my password back in. Looks like i will be skipping version 0.62.0
0.62.1 has a fix about Hassio panel and 404 error
The question then is: how will I upgrade when I can’t access the Hassio tab (I haven’t been able to use SSH since switching over to Hassio)?
I’m having a similar issue, but in 0.62.1
Same issues, not showing in 61 and now 62.
Error:
2018-02-01 19:53:10 ERROR (MainThread) [frontend.js.latest.201801300] https://XXXXXXX:8123/frontend_latest/panels/ha-panel-hassio-ad7aa9a6055f74475fd3ba2c00bfe512.html:1:829 Uncaught TypeError: Cannot read property 'setProperties' of null
Just to pile on, I’m having the same issue.
2018-02-02 10:10:26 ERROR (MainThread) [frontend.js.latest.201801300] http://XXX:8123/frontend_latest/panels/ha-panel-hassio-ad7aa9a6055f74475fd3ba2c00bfe512.html:1:829 Uncaught TypeError: Cannot read property 'setProperties' of null
Hey there!
Yep, you’re not alone.
Having the same problem here with 0.62.1…
I was on 0.61.
To be able to update to 0.62, I rolled back to 0.60.
Everything was OK, so I updated through Hassio to 0.62.1, thinking the problem would be solved.
Yesterday night it was working fine.
Today it isn’t anymore… 
ok, im not a dev with prototype, closest I have come is using Arelia as a playground. Here is the dev console log.
This is there 29 times.
hassio-app.html:1 Uncaught TypeError: Failed to construct 'HTMLElement': Please use the 'new' operator, this DOM object constructor cannot be called as a function.
at new o (hassio-app.html:1)
o @ hassio-app.html:1
Then this appeared. I hope this is helpful, makes sens to someone. Not sure I I am up for learning the UI in HA 
hassio-app.html:1 Uncaught TypeError: Failed to construct 'HTMLElement': Please use the 'new' operator, this DOM object constructor cannot be called as a function.
at HTMLElement.n (hassio-app.html:1)
at HTMLElement.l (hassio-app.html:1)
at HTMLElement.h (hassio-app.html:1)
at HTMLElement.t (hassio-app.html:1)
at HTMLElement.t (hassio-app.html:78)
at new j (VM5929 custom-elements-es5-adapter.js:4)
at CustomElementRegistry.value (VM5929 custom-elements-es5-adapter.js:4)
at hassio-app.html:78
n @ hassio-app.html:1
l @ hassio-app.html:1
h @ hassio-app.html:1
t @ hassio-app.html:1
t @ hassio-app.html:78
j @ custom-elements-es5-adapter.js:4
value @ custom-elements-es5-adapter.js:4
(anonymous) @ hassio-app.html:78
Surprisingly, my Hass.io tab has been working fine since my last post.
I’m wondering what happened…
Anyway, I am confident it won’t break again!
not working for me neither
for quite some time I have had an issue with my HassIO tab. In order to get it to load I have to go to it and then refresh the page
Same here, I have to refresh the page to get content in the Hassio tab. I get everything in the Hassio tab after refresh but if I go to another tab and comeback to Hassio tab, I have to refresh again