Fixture address vs. DMX channel

On my Studio Color 575 and Spots CMY, what's the difference between addressing them via fixture number or DMX starting channel?

The reason why I ask, is my rental house was out of HogII's for this last minute gig I had. I got this new Maxim LP board by LSC Lighting.

My Spots are fine, but my Colors jitter around. They function fine, all effects are accessible, as well as pan/tilt. But when they should be staying still, they are moving left/right up/down just a bit...constantly...as if they're making a square shape. All my dmx is fine, terminators used...I've dealt with Colors for a long time and have never had these issues.

Someone commented that they changed the Color to use Fix number instead of starting DMX channel. I won't be able to try this till tomorrow...but what would the difference even be between the two?

Thanx
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    [quote=TimMiller]I have run into this problem when running studio colors with mac 500's. They do the same little dance, yet the macs are all fine and happy. So what i have to do is run the macs on their own output of a splitter then the studio colors on their own and everything is happy.

    Yup! Same thing with Cyberlights. They sometimes dont play well with others so I always give them their own line off a splitter.:D
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    [quote=TimMiller]I have run into this problem when running studio colors with mac 500's. They do the same little dance, yet the macs are all fine and happy. So what i have to do is run the macs on their own output of a splitter then the studio colors on their own and everything is happy.

    Yup! Same thing with Cyberlights. They sometimes dont play well with others so I always give them their own line off a splitter.:D
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