Read about terminating the chain with a resistor 120 ohms. If your run has appreciable length, a termination MAY be necessary to avoid digital reflections that can corrupt the message between the control and the lights. Having separate power sources CAN subject the units to "ground bounce" that can also corrupt the digital control. You need to power all the units from a single source or conditioner if possible. Another solution might be to use one of the DMX radio links which would isolate the ground problem. Another fix you MIGHT try is to get some of the clamsheel ferrite devices that clamp around the wires. Put these around the digital cables, not the power cords:
http://www.google.com/products/catalog?hl=en&sugexp=ldymls&xhr=t&q=ferrite+core&cp=8&bav=on.2,or.r_gc.r_pw.&wrapid=tljp1304006132890014&um=1&ie=UTF-8&cid=761843538070174409&sa=X&ei=-Y25TaXFGsjYiALh_8ky&sqi=2&ved=0CFEQ8wIwAw#
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Thanks fredy2....I forgot to include in the notes above that I am using a terminator. It may also be possible that the fixture may not like the DMX address I gave it or it may just be that the fixture does not want to play nice any more. I going to add that fixture to the end of the chain and place the terminator on that one to see if it does the trick. Thanks again for your thoughts.
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