Unable to login to edX in Opera 42.0 on Ubuntu 16.04
Title basically explains it all, along with this picture (email redacted to hide my full identity). When I try to log in with my perfectly valid credentials, I get this error message. This does not happen in Firefox or Chrome.
I have an older version of chromium-ffmpeg-extras because the current version (at the time I did this, which was only a week or two ago) was incompatible with a lot of Flash video and content on sites like Twitter. Perhaps that has something to do with it, but I doubt it.