Can not get the events in Smart Client AccessControl Tab

As shown in the picture, no events is received in Smart Client AccessControl tab, when we swipe cards or unlock/lock the doors. And it 's no use to refresh.

Sometimes, we need to restart the SmartClient after a few minutes, and then , we can get the events info.

Why we can not get the events in real time? Someone for help, thanks.

In the Access Control workspace (tab) you can choose Live update instead of Today as time range, this will allow live updating and no need to use the refresh button.