Permalink redirects not working

I’m having trouble with my permalinks. I changed them so that they don’t include the date, but now I’m getting 404 errors. For instance, the following page looks fine:

http://www.bipolarvillage.com/sabina-lucia-photography/

but this leads to a 404 error:

http://www.bipolarvillage.com/2012/08/13/sabina-lucia-photography/

The first is generated through the /sample-post/, while the second is generated through the /2013/04/03/sample-post/ option.

This shouldn’t be happening, correct? I should end up on the page when I change the permalinks?

Curiously, for pages, it seems to be working:

http://www.bipolarvillage.com/what-is-bipolar-disorder/
directs to:
http://www.bipolarvillage.com/information/what-is-bipolar-disorder/

Which is what it should be doing.

I’ve tried resetting the .htaccess file, reinstalling wordpress, changing the permalinks to default and back…nothing.

Does anyone have any suggestions? I’m having a lot of trouble figuring our what to do here. Google results are leading to 404 errors.