Issue With Ribbon CRM 2011

Hi, I have two environments: dev and production.

I have custom entity. On the form of this entity i have custom button to open nem contact form.

I do this with this JScript code:

function addNewCRec() {
    var accountID = null;
    var accountName = null;
    var account = Xrm.Page.getAttribute("lookupAttr").getValue();
    var serverUrl = Xrm.Page.context.getServerUrl();
    var features = "location=no,menubar=no,status=no,toolbar=no";
    var defUrl = serverUrl + "/main.aspx?etn=contact&pagetype=entityrecord";

    if (account != null) {
        var accountID = account[0].id;
        var accountName = account[0].name;

        var extraqs = "parentcustomerid=" + accountID;
        extraqs += "&parentcustomeridname=" + accountName;
        extraqs += "&parentcustomeridtype=account";
        window.open(defUrl + "&extraqs=" + encodeURIComponent(extraqs), "_blank", features, false);
    } else {
        window.open(defUrl, "_blank", features, false);
    }
}

on New contact form i fill Parent customer lookup.

It works fine on dev environment but on the production I don't see ribbon. It is blank. What's wrong ?

I have alredy cleared cache and uncheck ' Load pages in the most recent version of Internet Explorer'

Crm2011 RU 15.