Update: my problem is solved after I moved to WordPress version 2.5.1.
Yes, I did try WordPress Default 1.5 and WordPress Classic 1.5, but the problem still remains.
I’ve got the same problem with my blog recently.
I’m using WordPress 2.0 for my blog. It works just fine before. I don’t have duplicates when I edit it, but when every single post/page is viewed, duplicates occured.
I’ve tried to remove all the plugins, and even changed my theme, but the problem still remains.
Advice is appreciated.
Thank you,
Ernest