Mask AI issues

Trying new Mask AI… When I save as, the save dialogue doesn’t remember my previous settings. I have to keep reentering Location, Color Space etc.
The calculation seems to miss a lot at the edges, which don’t tweak through Edges etc. At top is the original and the masked. At bottom two calculated versions. It seems to even struggle with a straight edge wall. On the Contrast one (which I thought was intended for simpler shapes, it throws up white artifacts near the building edge. You may need to zoom in to see this

Please raise a technical support request at the main website, note that you should try Contrast mode in an image like that to see if it makes a difference. It is above the COMPUTE button.

One of these images was done in Contrast mode - as labelled