LAMP WordPress site returning 404s

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http://unix.stackexchange.com – CentOS 6.4 64-bit Apache 2.4.6 PHP-FPM 5.5.4 Homepage from root loads fine http://csillamvilag.com But all other pages return 404 (CMS is WordPress). I am also able to access and log into WordPress backend. Additionally, Menalto Gallery 3 seems to be loading ok http://csillamvilag.com/kepek/ but all OpenCart pages return 404 http://csillamvilag.com/shop/ or http://csillamvilag.com/shop/hu/ Apache is running as user apache. All relevant WordPress and OpenCart files are owned by user apache. I have a suspicion that it might be a rewrite issue, but I checked .htaccess for both WordPress and O (HowTos)