Sub Pages Pretty URL Doesnt Work

[GreenFrog]

Hi ...

I am new to Get Simple. Right now I have a problem with "pretty url" when I use subpages.

My custom permanent link is: %parent%/%slug%

I have two pages which is

"Our Product" = (http://localhost/gs-me/our-products)
"About Us" = (http://localhost/gs-me/about-us)

But when I parent "About Us" pages to "Our Product" ... the pretty url link is broken which is supposed to be (http://localhost/gs-me/our-products/about-us)


My htaccess is like this:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^/?([A-Za-z0-9-]+)/?$ index.php?id=$1 [L]
</IfModule>

Any idea why this happen? Or Any solution?

Thanks.