having many of these issues all of a sudden and nothing has changed on our end, except an IPSConfig 3 patch update this month.
Your problems are not related to the Patch update, the patch is a change in the ISPConfig login code, not related to hosted websites in any way and an ISPConfig Updates doe snot alter existing sites at all. Problems with website permissions occur when you select a wrong PHP mode or when you miss to enable suexec. PHP mode in the website must be php-fpm or php-fcgi and the suexec checkbox must be on. I've moved your post to a separate thread as you reopened a 11 year old topic, especially as the info in the thread you re-opened is completely outdated.