After a frustrating week of not being able to comment on those blogs that used word verification, Stacey (CrunchyDiva) gave me a tip to UNCLICK the box for Stay Signed In on the Blogger Sign-in page. I did, and it solved the problems. Seems totally backward, but I'm not questioning a good thing .... just passing it along to those of you who were having the same problem. THANK YOU, Stacey!!!