Occasionally, in their infinite wisdom Google changes the magic which makes Blogger work. Ofttimes the magic has unintended consequences that Big Brother won't admit to, so we users are left to our own devices to create a work around. Well, I've been Googled, and perhaps you have too.
I am unable to post comments on your blog unless, if and only if, comments appear in a pop up window. I know G didn't single me out for this special attention because smart people who also were victimized told me how to solve this problem, so I'm not taking personally, but I do miss adding my 2 cents here and there.
There is a fix, but you have to do it. It's not hard, won't change the appearance of your blog, and might reawaken commentators thought lost who are secretly crying in the wilderness. Here is what you need to do.
At the top of your New Post Page, or Edit Post page there are several tabs.
Click on Settings
Within Settings: Click on Comments
3 lines down at Comment Form Placement, click pop up window
At the bottom of the page click Save
All done, and it took longer to read than to do.
Your readers thank you.