I have installed the latest version of Concrete5 5.7.5.1 - after the install I go to the domain name but the website is blank and looking at the console it appears to be a 500 error.
I think it has something to do with the permissions on the server and in the past I have had to put {TMP} in the save.session_path but I don't want to do that again in case I conflict with something else on the server.
This is a linux based server using plesk... if that helps anyone