I have started getting occasional errors on Geekzone when trying to submit a post in Opera. The error is an Opera one that says Geekzone is off-line and cannot be reached. Repeated reloads make no difference. If I try a different browser, such as Vivaldi, it works normally so this must be specific to Opera. When it just occurred again, the following message popped up:
Failed to load content css: https://cdn.tinymce.com/4/skins/lightgray/content.min.css
Not sure what this is saying but it appears to be some kind of compatibility issue between GZ and Opera. I just updated to the latest 'stable' version of Opera the other day, 44.0.2510.1449.