Hi,
We have Windows Server 2016 where is installed Moodle with Apache 2.4.23, PHP 7.0.9 and mysql.
I can login, but when trying to open site administration sub folders, I get "Invalid permissions detected when trying to create a directory. Turn debugging on for further details."
The system was running okay, but I changed site/adminstratio/security settings
Removed Cron execuiton selection and set cron password for remote access.
After that, when trying to use site administration setting, I got error "Invalid permissions detected when trying to create a directory. Turn debugging on for further details."
Also sometimes I got error "Invalid permissions detected in $CFG->dataroot directory, administrator has to fix permissions."
All created courses are visible and running.