I too connect my MI-250 directly to my PC via Cat5e cable (no routers, is a direct connection).? I'll share my Network settings in case they are helpful.?
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I'm going to go out on a limb and say if you had the same issue with a previous unit, the chances of getting two bad units is pretty slim.? You may want to remove the motors and see if the buttons work under a no-load situation.
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When the "Speed" button on the HC is set to "Slew" and you press a tactile button on the back of the HC, you are not bumping up against a Safety Limit are you?
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Just trying to think of every situation that would cause a no slew situation.
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