Borjis,
When you hook up the Dell to the Multibridge for monitoring SD definition do You see any horizontal artifacts, sort of lines outside the image?
I have seen this on my Dell when connected to the HDlink.
Blackmagic Support told me that there is an electrical issue with the Dells.
Same configuration with the cinema display and everything is ok.
By the way,
when You were making the LUT for the Dell, did You judge the image by eye comparing it to a CRT or did You use some sort of instruments?
I am asking because I would like to make a lut for the Cinema Display since something seems to be wrong with my Dell
Greetings
Piotr