Cannot run two webcams simultaneously under Mountain Lion

I am working on  a film project for which I want to record skype calls while I at the same time record the "local" side of the conversation in HD quality with the C910 in the Logitech webcam software. Hence, I want to run two webcams at the same time. The in-built laptop camera in Skype and the C910 in the Logitech Webcam software.
I have had a lot of difficulties doing thid in Mac OS X. On my old MacBook Pro under OS X 10.6.8. the logitech support recommended initiating the skype conversation with the Isight camera first and only then launching the Logitech software and starting the recording with the C910 cam. That worked fine.
Now, however I have to do the same on a newer 13" MacBook Pro with OS X 10.8.4. and built in Facetime webcam and it just won`t work. Only one webcam functions at a time. If I launch the Logitech software first, the Facetime camera won´t work in Skype   And when I start a skype conversation first, I only get a black screen (no failure notice whatsoever, the C910 is still detected) in the Logitech Webcam Software.
I am completely desperate and Logitech product service only told me I should contact apple support. Does anyone know how I can get both webcams running simultaneously?

I am trying to do something similar...not necessarily with skype but need to connect two webcams (via wifi) and want both feeds displayed simultaneosly on imac.  hoping my reply boosts this thread

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