Multicam : my 2 angles preview windows are black

I try to make a multicam with 2 different footages and even I converted both in FCPX, when I make a multicam my 2 angles preview windows remain Black When I click on both black windows to make my multicam final footage, it's working, I mean the Multicam footage is working well (but I have to do it in blind mode).
I'm 10.0.7 and my Imac is a mid2010 corei7 + 16Go so everything is usually working well...
FYI I tried with several different footages (GoPro, 5DMKII, etc) and it's the same.
I chose automatic settings for the TL and for the multicam.
Any idea ?

Sure, here it is :

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