Sussed out where the issue is.. In Users I had disable the visual editor when writing checked.. I unchecked that and the problem vanished!
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I don’t keep it enabled because I enter html in the editor & if I accidentally click on the visual editor it messes everything up. I’ll see what I can do other than disable the visual editor as there’s lots of settings for the tiny editor.
Thanks for your responses, at least if it crops up again whoever sees this will know where to look.
Phil