Hi! Mine works fine. In the JVC camera, recording settings are set to “HD, QuickTime, 1920x1080, 30p, 50M”
You can check those settings by going to Menu>System>Record Set>Record Format on the camera.
The HDMI settings on the camera can be checked by going to “Menu>AV Set>Video Set”. Mine are set to 1920x1080/30p. Check these settings on the camera as well.
I’m using it with a Logitech C920 plugged into one of the USB ports of the Webcaster X2 and it works great.