Troubleshooting with logitech camera

Hi, does anybody have experience with a logitech camera and jachtrip. My camera settings on computer are ok and the camera works ok e.g. in Zoom-Meetings but Jacktrip does not recognize the camera, while it was no problem with the same camera 3 weeks ago. I tried zu search for a solution in the computer settings, but all seems to be ok. I´ve no idea! Could s.o. give me an advice? THX Friedemann