Monthly archives not working

Hello…

I have a custom permalink structure:

/%day%/%monthnum%/%year%/%postname%/

Now, when I click my monthly archives they go to the right links, such as 03/2008for March, but the archives just don’t show.

“Sorry, no posts matched your criteria.”

So if I change the structure to one of the defaults:

/%year%/%monthnum%/%day%/%postname%/

My monthly archive links change correctly again, to 2008/03 for March instead… and they work!

But I’m British and it just doesn’t make sense to me as year month day, I want day month year lol

Hope someone can help =)