Blogger has been having some issues and a lot of people are having troubles commenting.
I too have been having problems posting. It is highly frustrating.
Here is a link that may help; http://www.google.com/support/
I followed the instructions about clearing the cache and cookies, opening blogger.com, but pressing Cntrl & F5 before logging in and it seems to have worked... somewhat for me.
I can now comment on blogs, but I am still unable to "Like" a new blog.
In order for me to “Like” a new blog I’ve had to download Firefox. This is the one I used; http://www.mozilla.com/en-US/
Blessings Pin It Now!