After installing the 1Password Safari extension I find that some website - e.g. https://discussions.apple.com/welcome - will not open. If I disable the extension and restart Safari, the site will work again. If I then re-enable the extension it will continue to work for a while, but ultimately ends up blocking the site again. I've tried reinstalling the extension but this hasn't helped.
I'm running OSX 10.13 High Sierra, Safari 11.0, 1Password 6.8.3 and 1Password Safari extension 4.6.11
1Password Version: Not Provided
Extension Version: Not Provided
OS Version: Not Provided
Sync Type: Not Provided