The report does not include any file, but probably that file is using the settings for unified colors, which are currently not available in the UI, so it always paints black. This enables unified colors and secondary colors for sculpt vertex colors, so it should solve that issue. Unified color does not make much sense now as the Paint tool is the only one that has paint capabilities, but it will do in the future when sculpt and paint at the same time is enabled and the paint capability is added to more tools. Reviewed By: sergey Maniphest Tasks: T78323 Differential Revision: https://developer.blender.org/D8136