Blog posts not working

I’m running WP 3.2.1 (no Multisite) with Marketpress installed. I want to have the blog as frontpage, but I cannot seem to configure properly. BTW- I also have GridMarket 1.3.5 as theme. I created a page named Blog, and with slug /blog/ and go to Settings->Reading and set Front page = Store, and Posts page = Blog, but when I click on Blog in frontend it takes me to the Store? What am I missing? Site in question: http://216.120.252.8/~sbadmin/dev/