In order to make sure my server is compatible with the coop code. I reset my account domain from domain with static html pages to my blog sites domain. Under the main domain, I have 6 blog sites host as sub-directories and link each other. I add the ad_network.php and ad_network_ads.txt to 6 subdirectories and root directory as well, also set all ad_network_ads.txt as 755. Top of that, I add following php code to each blog's footer place. <?php ini_set ("include_path", ini_get ("include_path") . ':../:../../:../../../:../../../../'); include ('ad_network.php'); echo $ad_network[1]; ?> None of ads show up in my index page or subdirectory pages. My server is php enabled apache. I even tried to add .htaccess using AddType application/x-httpd-php .php .htm .html to upload my root directory, ads still not show up. Also got problem if I click my blog links, window pop up and ask me whether I want to download files. Then I delete the .htaccess from my server. I just don't know what is wrong with all these? How can I fix? My domain is umindset.com. I set up my account by using one of my subdirectory -blog like umindset.com/niche-profits/ Help ! HG