Problem summary
Customers are experiencing artefacts when painting in 3.1v1. It seems to be exaccerbated by subdivision level. The problem seems to be archive specific, but is not related to any of the image data. If taken to another version of the program the artefacts remain. See below for illustration of the issue. Customer reported version
3.1v1 Customer reported platform
MACOSX 10.11 El Capitan
Steps to reproduce
1)Open the Archive at \\netshare\support\4Borna\skin_test_3.1v1
2) Paint on any layer other than the base
3) Deleting a channel and starting again does not fix this
4) If you go to Channels > Export Layers As Flattened > Export
5) The artefacts will remain in the output textures
Reproduced by support
MAC OSX 10.11 and Windows 7 : 3.1v1 and 2.6v5
Expected behaviour
For the paint to behave without creating undesired patterns
Actual behaviour
Artefacts where created when painting.
