unfortunately,there is no error.log created, and as i said,same server,same chmod for all and same scripts installed on all,4 domains no problem but this one is having a problem,all files set to 644 and all folders to 755, manually checked it all, if you like i can provide you access to server and the site back end,feel free to have a look and confirm it all yourself, no plugins,nothing else is installed,default wordpress installation with only generatepress theme and gppremium plugin