Hey Guys!

I got a Problem with an own LogIn Module.

Explanation:

I have a Controller "MemberHandler_Controller".

Routing:

Director:
  rules:
    'base': 'MemberHandler_Controller'

Then i have a AJAX-Form which will LogIn a Member.

    // Login Form
    $("#loginForm").submit(function(event) {
        var email = $("#inputEmail").val();
        var pw = $("#inputPassword").val();
        var remember = $("#rememberLoginInput:checked").length ? "True" : "False";
        $.ajax({
            url: PreUrl+"base/login",
            data: {email: email, pw: pw, remember: remember},
            dataType: "json",
            type: "POST"
        }).done(function(result) {
            if (result.success) {
                window.location = PreUrl;
            } else {
                $("#loginMessageArea").html(ErrorPreHTML + result.message + ErrorAfterHTML);
            }
        });
        event.preventDefault();
    });


To avoid some stupid Errors i have shrinked the Login Method to that:

public function Login(SS_HTTPRequest $request) {
$email = "test@test.com";
$user = OBUser::get()->find("Email", $email);
      $user->logIn($remember);

        echo json_encode(array("success" => true));
    }

Now i Press the Login Button at http://localhost/ProjectName/
It  will send an Request to: http://localhost/ProjectName/index.php/base/logout
Now i get redirected by JavaScript to: http://localhost/ProjectName/index.php
I can browse the Page now, on every underpage i am logged in like on:

http://localhost/ProjectName/index.php/about-us/

or 

http://localhost/ProjectName/index.php/contact-us/
BUT if i go to a site without the "index.php" like http://localhost/ProjectName/ i am Logged Out... 

if i go back to http://localhost/ProjectName/index.php i am still logged in.
What is the Problem?
Very much Thanks in Advance