[eluser]BrianDHall[/eluser]
You are definitely doing the right thing by clearing the server and trying to get an unmodified CI install working. It is actually pretty unusual to have such issues with a basic CI install as they usually work out of the box. So it is definitely a server issue of some sort.
First, we'll assume a default install with only the url modified. Skip any special config alterations and just pop in the web address as indicated in the file.
Now you should try: website.com/ - should be your welcome to ci page
website.com/index.php - should be the same
website.com/index.php/welcome/index - again, the same
website.com/index.php/welcome - again, the same.
Then try making a new controller by copying the welcome controller and changing the names as appropriate, leaving index() and just changing the name of the constructor and class name.
so you should have test.php in the controllers folder, class Test extends Controller, with a function Test() constructor, and a function index() for the default page.
then try
website.com/index.php - should be welcome
website.com/index.php/test/index - should work
website.com/index.php/test - again, should work.
Try again with and without trailing slashes, and report back what happens. That should narrow down where the problem could be.
Then, in every case go back in and add a trailing / and make sure everything still works.
