Black screen with Kensington K33928 and Apple 20" ADC display

[mcng]

Hello,
I just acquired a Kensington Model M01063 Product # K33928 which I believe is a DL195, I'm trying to make it work with a Macbook Pro running 10.8.5 and an ADC 20" display connecting with the Apple DVI to ADC converter.
The ADC 20" display and DVI to ADC converter are working fine when connected to a mini display adapter.
No matter what I try, I got a black screen, I tried several plug in sequences, drivers from kensington then directly from DisplayLink versions 2.1 then 2.0 then 2.1 beta, no go. I performed deinstall reboot reinstall reboot each time I installed a different driver. I tried the different Macbook USB ports as well, still nothing.
I installed SwitchResX and exported EDID for the ADC through mini display port then through DisplayLink, (left is mini display port, right is DisplayLink), named it "display a" (see attachment).
Because I've got a second ADC 20" display here is it EDIDs diff as well, (again left is mini display in, right is DisplayLink), file is "display b" (see attachment).
Hope these could be of help to improve support of this model. Regards