Two C920 cams with same name (no #1 and #2) - can't switch

Dear ladies and gentleman,
I installed two webcams (logitech c920) today and wanted to use manycam. Contrary to earlier times the computer system didn‘t assign the two cams with different names, so I can‘t switch in manycam between the two webcams. I think it‘s a problem of the Mac system. In skype or facetime the two webcams are assigned equally (not as #1 or #2 as earlier) but here I can switch between them. Can you help me with the problem? Thanks in advance, kind regards

@Matthias_Baumann Please try to update your ManyCam to the latest version: ManyCam | Live video software & Virtual Webcam