AX 2012 R2: WINAPI::setWindowText doesn't work (on customer machine)

Setting the title text in info.workspaceWindowCreated() using WINAPI::setWindowText

  works ono our machine

  but doesn't work on customer's machine

We deployed all 3 databases (xxx, xxx_Baseline, xxx_model),

user role: administrator

identical lizences

Kernel version 6.2.1000.1437

Application version: 6.2.1000.14347

The connection to the client is via Citrix

I wrote a job that changes the title text on the developer workspace:

static void test_ws_title(Args _args)

{

   int hWnd;

   ;

   hWnd = infolog.hWnd();

   WinAPI::setWindowText(hWnd, 'test');

}

it works on our machine,

but it doesn't work on the customer's machine.

Any ideas?