Do you think this Pega Tube will be of any help ?

https://pdn.pega.com/pegatube/support-guide-troubleshooting-missing-busy-indicator-after-clicking-assignment

Hi,

pega.ui.busyIndicator is the main object - you can use the following code example to define the function and then use them in Run script action

var myappGlobal = {

    busyIndicator: undefined

};

var showBusyIndicator = function () {

    try {

        if (pega.ui.busyIndicator) {

            if (!myappGlobal.busyIndicator) {

                busyIndicator = new pega.ui.busyIndicator("Loading", true);

            }

            myappGlobal.busyIndicator.show();

        }

    }

    catch (e) {

    }

}

var hideBusyIndicator = function (e) {

    try {

        myappGlobal.busyIndicator.hide();

    }

    catch (e) {

    }

};