Hi Remy:Thank you for your reply, which I found on the Mail-Archive.com. For some unknown reason, I am not receiving emails from [libreoffice-users] via my Thunder Bird email client (imap account).
As for the red-box issue, it resolved itself after I closed and reopened the LO Calc file that I was working on; so, I am happy again. :-)
I have been using AOO-Calc for a while, and am now making a slow transition to LO; viewing YouTube tutorial videos (https://thefrugalcomputerguy.com/) for Calc and Base. Appreciate your information.