dp8k artnet prob

Hi All
just moved from a RHFB to a hog3 + dp8k today swapped all the settings for the artnet to drive my graphics computer and all of a sudden my mac wouldnt see the artnet ?
plugged in my elc box with same add and it read fine
do i need a croosover cable for the artnet port ??
Ive had no probs all year `apart from the 2 times using the dp8k
thanks in advance
mikey
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