Mail.app won't let me copy more than 2 lines in an email

RobinS

robins
Mail (latest) has been acting very strange lately. Every message I want to read has to be adjusted by clicking
View, Message, Plain Text Alternative
When I read another message and go back to it, I have to do it again. This never happened before.
I can't add attachments to any new email, reply or forwarded email. I can't drag a picture into the message either.
I can't copy and paste more than a couple of lines of text. If I try it again below the couple of lines that pasted nothing happens.

?????????
 
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