blog links to wrong blogs?

Now that I've added this VBSEO thingy to my site, my blogs aren't functioning. Well, they are - but for example, say I follow a link to;

http://mysite.com/blogs/karlm/my-super-blog-entry

Although that is the address in my address bar, I find I'm reading a different blog, say;

http://mysite.com/blogs/some1else/this-isnt-my-blog-so-wtf

Any ideas?

use a preset or custom setting that includes the blog ID in it.

Done - ta