PHP_AUTH_USER is a pretty common value. It gives you the user that logged in while using .htaccess logins. Any script that uses that will no longer work on FastCGI. Again, I have posted what the solution is on another thread. And it's a good thing there IS a simple solution to this. But that's not the point. The point is you updated Apache functionality without EMailing us..........And if I hadn't found the solution about a week earlier (took me about a day to find), it would have been a lot worse......
PS. It sort of begs the question that the solution to this is to use a different Server variable: REDIRECT_REMOTE_USER, which obviously IS populated with the logged in user. What would have been so hard to instead keep PHP_AUTH_USER populated..........lol......I realize that's part of Apache and not JodoHost.......but really......lol.........z