Hi @sonic, thanks for your report. I have also updated to this version but seems OK for me. To be clear, I assume you refer to the Tobii System tray icon as the applet? Certainly, turning ‘OFF’ eye tracking should disable all lights. I wonder if this happens again on another USB Port? Have you restarted the computer since the update? Also, I assume you are working with the 4C? Some additional system specs would also be good to have including any USB3 Hubs you might be using.. Thanks.