Community
subdivide your mesh twice should do the trick...
or cut in more edges... mudbox dont like thin long faces...
and take a look at this threads...
http://area.autodesk.com/forum/autodesk-mudbox/community-help/dry-brush-artifacts-mudbox-2013/
http://area.autodesk.com/forum/autodesk-mudbox/community-help/cloning-artifacts-in-mudbox-2013/
http://area.autodesk.com/forum/autodesk-mudbox/community-help/strange-paint-behaviour/
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