Problem Posting

I have a blog at https://www.acharya03.org/news. I was trying to post and what happens is when I click on publish, I get a blank page and the post disappears. I use Firefox 2.0, but when I tried it on IE 7, it didn’t work either. Interestingly, my wife can post just fine. This implies a problem with my login account, but I don’t quite understand why this is not working. Any advice is appreciated.