I move ngui objects around all the time (most often using itween). It's most likely an issue of the depth being the same as something it's moving over (then you get a weird alpha type effect). Make sure the sprite or whatever you are moving is at a higher depth than the background and lower than any foreground items.
If that doesn't work you could post a little demo of the problem (make a project with a single scene demonstrating the issue). I'm sure it's something simple if it's not an issue of depth.
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