I am trying to create a mask for a local adjustment using the graduated filter. Next, I erase some of that mask using the brush tool (and holding Alt key). Consistently, the rendering of the mask permanently breaks in such a way that only see fraction of the actual mask and some boxes spread around the image canvas in areas the mask never was in.
I don’t think the mask was really broken for me, only the rendering. At least I didn’t notice it. But also I’d say it’s hard to tell really what’s going on because the squares wandered around whenever I changed the zoom level.
Now, this makes me wonder what needs to happen for DxO Support to recognize this. It basically cripples masks quite a bit, they become unusable for anything advanced.