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Transparency Setting for Raster "No Data" Using ArcMap for desktop 10.1 SP1

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For some reason, my "no data" is showing up as black instead of transparent.
Attachment 20470
Not always...
Attachment 20471

I looked into ArcCatalog and saw the proper assignment of the 'no data' value... Tried both ignoring background value (under stretched) and setting it to the no data value with a 'no color' selection.

Ideas? I'm trying to mosaic several datasets together.
Attachment 20472
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