Adding EVOHome Breaks History page?

Hi All - please be kind & patient, I’m a noob here!

I find that when I add the following to configuration.yaml stops my history page working:
platform: honeywell
username: erm@somedomain
password: isasecret
scan_interval: 600
away_temperature: 12
region: eu

After adding this config, I do see my EVO Home data is collected properly but the history page stops rendering. I just get a spinning dot and the page never renders.

Any help very much appreciated…

Thought I’d update:
It was a Safari fart! All works perfectly in Chrome. Didn’t dig to find out why…