Java jScrollPane не отображает полосы прокрутки

var checkTimeout;

$(document).ready(function () {
    checkTimeout = setTimeout(checkSession, 900000);
});

function checkSession() {
    $.ajax({
        url: "/Account/CheckIfSessionValid",
        type: "POST",
        success: function (result) {
            if (result == "False") {
                window.location = "/Account/LogOff";
            }
        },
        complete: function () {
            setupSessionTimeoutCheck();
        }
    });
}

function setupSessionTimeoutCheck() {
    clearTimeout(checkTimeout);
    checkTimeout = setTimeout(checkSession, 900000);
}