/blog has appeared in our site

Hi,

The word
/blog has appeared in our wordpress structure
We upgraded wp and buddypress and it appears to have come back after that
For example posts now have
http://www.worldcollectorsnet.com/blog/news/4142-swarovski-lime-panther/
They work but we have some hard coded links and we do not want /blog to appear
I cannot remove in permalink structure as it faded out.
How can I remove?
Thanks
Darryl