DL.3 SDI Problem

Hi,everyone,I wonder if somebody can help me with the DL.3 SDI problem
I use two DL.3,and set unit 1 to be SDI out,unit 2 to be SDI in,what I configure in the Hog is:

On Unit 2 which are capturing SDI, I set the graphics layers to Media Folder 255, File 2 to access the SDI capture.

On unit 1, I set the camera relays to internal camera capture
1) Opening the iris
2) On the Motion part of the fixture, select "Capture" on the slot toolbar buttons, then "camera"
3) Close the iris for serval seconds
4) Then I set the fixture to output SDI by selecting "Fixture Camera to SDI" on the control parameters. It will take 5-8 seconds to switch.

What the problem is unit 2 project can project what unit 1 capture,but seems to be with the camera effect white/black,I set the unit 1 camera effect to be "off",but it doesn't work.On unit 1,I also feed the internal camera for capturing,and it's the same problem.

I try to swap the SDI in/out for each DL.3,but it's the same,swapping new SDI cable doesn't work,either.

But with s-video it's fine.