I can't reply to posts. I am using macOS Catalina which is proving to be rubbish on sites

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Whatever its merits, macOS Catalina is a headache let loose on the Internet.

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This is a test reply to see if I can respond to my own post. Chrome browser on Catalina.

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Now to see if I can post a reply to myself using Safari on Catalina.

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So that worked. I am wondering what was going on earlier.

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I've managed to post a reply to a reply to another Thread using Safari on Catalina OS so whatever the problem was is sorted.