Why isight can not be recognized by non apple software?

Hi all,

I'm in front of a strange problem.

My isight, on the macbookpro as well as the display one are working properly and are displayed in the system profiler informations.

They are working well with facetime or photobooth for instance, or for taking a id photo in google mail for instance.

But I can not get the video working with skype.

Skype knows the isight is there but it doesn't open it.

I also use mathematica program.

Just to test, I tried the Currentimage[] function which was working well a few months ago (I don't use these function so much), and it is not working.

No camera for mathematica.

Does someone has a clue ?

I reinstalled skype various time. Clean install also.

I did a SMC reset.

Shut down and open again, …

Nothing change.

Thanks.

Arno.