Can't paste into comments in Adobe Acrobat

Hi,

Up until recently, I've been able to copy text from a PDF file or a .docx file and paste into a comment box in Acrobat.  However, today, it just won't paste.  I can paste the content in Word, but not into the comment box.

I have been successfully able to copy into a Notepad document, then copy from there and into the PDF comment, but I'd like to be able to go back to normal copy/pate.  Has anyone else had this issue?

I've done the usual restarting, but that hasn't helped.

Thanks