After updating to 2.2.1 version now when you use trackpad tap (not press but just tap on on the pad) it does not properly registers by Picard UI and in most cases is treated as "mouse button press down", i.e. an icon you press on will change to "dark" color to indicate that the button was pressed but will gets stuck in this pressed state. You have to repeatedly tap on that icon to register button release and get the action to trigger. This happens only with finger tapping on a trackpad, when I do a normal click on the trackpad it always registers as button down-up (i.e. click) and it works. I can tap on all icons and put then in this pressed down mode. I think it's QT bug or something. I did not notice this weird behavior with the previous version 2.2.0 but once I have upgraded I hit this issue instantly. Attaching a screenshot with all top row buttons pressed down.