My first experience was I couldn't comment on my own blog posts. At first, I thought it was blogger and waited patiently. Then I tried Google for a solution.
The most common suggested solution was to clear your cookies and cache. I was using IE9, and this didn't work for me. But, give it a try. I then decided to switch browsers. I'd been having trouble with IE locking up for a while now anyway. So, I switched to Google Chrome and it's been smooth sailing since.
Then, a follower contacted me. He couldn't comment on my blog. After more research, I learned this may be a blogger issue. The suggested solution was to go to Settings - Comments - Switch from 'embedded below post' to either of the other two options. This seems to have corrected the issue.
I hope this post helps someone out there get back to commenting on their favorite blogs.