I'm not crazy! There is a real problem leaving comments on Blogger. Others are discussing it in the Something is Wrong Google Group.
I have tried to leave comments on at leats 10 Blogger blogs. My attempt gets stuck at the word verification prompt. There is no word in the verification window...it just says "Loading..." With no word to verify, I cannot leave a comment.
I turned off word verification on this blog until Google irons things out. Others may want to weigh doing the same, or miss out on comments.