Beginner. Why is there black spots on the paint that disappear with settle option?

Painting reveals color yes, but it reveals a black color that disappears when settled. How do I fix this. Is this a bug or how the program works?

That sounds strange. Do you mind showing me some screenshots? It would be useful if you can show me your system info too, since it might be due to some out dated graphics driver. Please see the first screenshot in this page on how to get System Info from Expresii: https://www.expresii.com/support.html

Admin wrote:That sounds strange. Do you mind showing me some screenshots?  It would be useful if you can show me your system info too, since it might be due to some out dated graphics driver. Please see the first screenshot in this page on how to get System Info from Expresii: https://www.expresii.com/support.html

Hasn't happened in a while. But its black spots that cover certain parts of the paper. They cannot be drawn over until I settle the board. Afterwards I can draw on those pieces of board.

Expresii x64s [Microsoft Store Version] (v.2021.09.10) - 2021.09.21 8:04:15 PM started
OS: Windows 10 Pro (10.0)
CPU: 11th Gen Intel(R) Core(TM) i3-1110G4 @ 1.80GHz
Mem Free/Total: 2.5 GB / 7.9 GB
Max Touch Count: 10
GPU: Intel(R) UHD Graphics; GL 4.6.0 - Build 27.20.100.9664
Max Texture Size: 16384 Max Output Size: 16384
Screen resolution: 1920 x 1280 (DPI Scale 150%)
LoadLib sucessful: Wintab32.dll
Stylus: Vendor Wintab32.dll (x:25919 y:17279 p:32767 @ 200Hz)
Local IP: 192.168.1.137

Yours is an Intel 11th-gen CPU so the driver should be fairly new. I don't own an Intel 11th-gen CPU to test with, but for your information I tested with older Intel, AMD and Nvidia GPU and don't get any black spots.
If you encounter it again, please post a screenshot so that we know exactly what it looks like. Thank you.