Pan Window Follow Track command stops working

yes! thanks for the help - I'm using the "Pan Window Follow Track" command, code below:

var lastFocusedTrackName;

function main() {
var newName = sf.ui.proTools.selectedTrackNames[0];
if (newName === lastFocusedTrackName || newName === undefined) return;

lastFocusedTrackName = newName;

sf.ui.proTools.selectedTrack.trackOutputToggleShow();
}

function runForever(name, action, interval, timeout) {
var now = (new Date).valueOf();
if (now - globalState[name] < timeout) throw 0; //Exit if we were invoked again inside the timeout

globalState[name] = now;
sf.engine.runInBackground(function () {
    try {
        while (true) {
            sf.engine.checkForCancellation();
            globalState[name] = (new Date).valueOf();

            action();

            sf.wait({ intervalMs: interval, executionMode: 'Background' });
        }
    } finally {
        globalState[name] = null;
    }
});
}

runForever("isFollowFocusedTrackRunning", main, 500, 5000);