I'm using Fastmail's website.
The problem went away after about 10 minutes, and I was able to reply. Notice that it was the same session, I hadn't logged out or anything. I have no idea why.
But when/if it happens again, I'll try your suggestions. But just for clarification: Do you suggest I clear cache and cookies? Because I never do. I can delete all Fastmail cookies and all the cache of course, but I don't see any need to clear other sites' cookies.
Thanks for your suggestions. Much appreciated!
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