Hacker did it for me!

UPDATE:
I deactivated All in One SEO plug-in and that took care of the problem. Sorry, don’t know how to delete this post.

Hi:
After unsuccessfuly trying to get a title to appear for my blog, someone registered and very impolitely, put one up of their own!

I’m talking about the firefox title bar, not the h1 or h2, titles.

I deleted the un-welcome guest, and have spent the day, trying to get rid of the unwanted title. Admin / options shows the title correctly, and I have scanned almost all the php files, header.php, main index.php etc. Can’t find any malicious code. I switched themes and it’s still there. I’ve searched the forum and can’t find my answer.

Here is the url: https://www.iplanretirement.com/retirementblog

That’s the hackers title not mine. He/she was registered as “subscriber”. Any one else encounter the same problem, and more importantly, the solution?

Thanks