My Thunderbird (Mac-v.24.6.0) suddenly won't accept HTML (composition color change) checked under Tools tab.Won't type blue email text.Why?

Suddenly, for no apparent reason, Thunderbird keeps reverting to black text when I compose emails.
I've (long ago) changed all the required setting so as to have text of my emails be (HTML) formatted in blue:
Under Tools/Account Settings/Composition and Addressing - there is a check mark beside
"Compose Messages in HTML format".
If I click Global Addresssing Preferences/Composition/General - the text color shows as BLUE
And when I open a new email window and click the text colour shows as BLUE there, as well (which is what I want)
But when I go to the new email window and type - the text is black!
Why is this suddenly occuring...but more to the point - how can I resolve it?
Would appreciate any helpful insight. Thanks in advance....

I've now uploaded a screenshot with this post. I hope it will further clarify what I've tried to describe. (Won't know till I've posted it here and can see how the screen shot actually looks online)
The screenshot image has 3 parts:
At the top is my Firefox browser - which is only there to cover my actual email address which would otherwise show at the top of the image beneath it in that same screenshot. (So disregard)
That 2nd image is what opens in Thunderbird when I click on "Write" in the tool bar - in order to compose a new email.
As (I hope) you can see - the previously configured BLUE composition text setting is showing above the email window - but in a *greyed out* manner.
Furthermore, as soon as I position my flashing cursor insertion point over to the left and type just one single letter - the greyed out blue rectangle turns jet black!
That's what the 3rd image in the screen shot, at the bottom, is showing. And the text I subsequently type is BLACK - not BLUE!
I cannot fathom why this occurs or how to correct.
Can anyone assist?

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