Please help? Blogger won't let me comment

Hey there, 
Just a quick post and a bit of an ask for help - basically I can't comment on other people's blogs and I can't reply to comments on my own blog.

Everytime I type out the comment and click on the publish comment button, my comment just disappears and nothing comes up.

I was just wondering if anyone has had similar problems and knows how to fix it. Also if someone can try and comment here just so I know if comments are working on my blog or not.

If you can't comment, please let me know by email

Thank you very much in advance!