You should have a green and blue flashing S/D icon in the system tray (bottom right hand corner of the task bar near the clock). When you minimize the GUI, it doesn't stay in the task bar, you have to double-click the system tray icon to bring it back up. The only time you need to click on the icon is when you first open the GUI upon service restart, which explains why it works for you after restarting the services.
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