[Plugin: NextGen Galler] Image links not working

Hi,

I’m new to wordpress so apologies if this is silly.

I’ve successfully uploaded my images into two galleries and have made two posts. When I click “preview” through my edit window, everything works, here’s the url:

“…/wp/index.php/wp/nggallery/image/p6140003?p=112&preview=true&preview_id=112&preview_nonce=2ac9c88450&post_format=gallery/”

However, when I logout and just view the post, the url goes to:

http://alrig.com/wp/nggallery/image/p6140003?p=112/

and I get a 404 not found. If I modify it to:

http://alrig.com/wp/index.php/nggallery/image/p6140003?p=112/

it starts working. What am I doing wrong?