Could someone tell me what these are and how to correct?
I am getting this when creating a displacement map with Displacement Map on Mac
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come on
your lack of responses might be due to the fairly large thread that covers this issue:
http://www.zbrushcentral.com/zbc/showthread.php?t=64630
Displacement on mac is not currently working the way it is supposed to. Pixologic is aware of the problem and has said that it will be fixed in an update.