Yes! Unclicking the "keep me signed in" box has helped but not 100% of the time.
I often have to reload the page to get the link or text box to post a comment to show up (but not this time).
I have heard a lot of people complain about Blogger comments. I started having major trouble even reading Blogger blogs a few days ago, and bit the bullet and switched from IE to Google Chrome for Blogger reading only - so far no problems with reading or commenting from Chrome.
Yes if you have sign me in automatically checked then uncheck it and log out. When you log back in you should be able to comment.
Note: Only a member of this blog may post a comment.