Up until last week I could not leave comments on blogspot blogs that did not have a pop up options.
So after a lot of research I finally found out why and thought I would share because it really frustrated me. When I looked in help they just kept telling me to change my comment to a pop up, but not how to comment on other blogs.
So here you go...
1. go to tools
2. pick options
3. pick privacy
4. check -accept third party cookies
This seems to happen if you are using fire fox
hope this helps someone!