FCPX with multi[ple Blackmagic Decklink cards NO Video OUT

I have on my Mac Pro 12 core a DeckLink Duo and a Quad card installed.
The Quad card is for 4 channels ingesting (JustIn ToolsOnAir) and with FCP7 video output is no problem,
it's always the first output of the Duo card. FCP7 output overrules Desktop Video.
In FCPX, Desktop Video must be set on the desired output, when I change the first card in Desktop Video
in the preference pane of FCPX all the outputs are the same as the first, so for example 6 x 1080P.
There is sound but no video or the video is black, the audio from the DeckLink is oke.
I have 2 startup disks, 10.10.5 and 10.8.5, also with different Desktop Video versions, the results are the same.
With only one DeckLink installed no problem.
I did the same test with my MacPro late 2013, the same result.

I already asked Blackmagic Support and still mailing with them.
Anyone an idea?

What OS version and what FCPX version? BMD will probably be your best bet in solving this.

Hi Ben,

it doesn't matter which OS, FCPX and Desktop Video version.
Installing more than 1 DeckLlink channel no video out.
I'm waiting for an answer from BMD support.