Using a Sony FDR-AX53 camcorder via HDMI and a Logitech C920 webcam via USB on my new Webcaster X2. I get video from both sources, PIP works, all the shortcuts from 1-8 on the keyboard work, except the Tab button to switch full screen video source does not work. Only 1 source works, when I press the Tab button it does a flicker on th screen but doesnt switch. I have updated the Webcaster X2 already, switched keyboards, changed the usb camera output resolutions, tried a different webcam, same issue. Would appreciate any advice please, thank you.