I just came across this problem recently, now on a new HP 612 x2 running Windows 10 64. I installed the latest graphics driver, but that did not solve the issue. The only way I can make grab selected region work seems to be setting the desktop zoom in Windows to 100 % for all displays. As soon as I set one to e.g. 150 %, the described zoom phenomenon appears. Even if I set all displays to 150 %, the problem persists.

In my configuration it is not an option to work with the same zoom for all displays as the physical sizes and resolutions differ a lot. I've been using Screenshot Captor for many years now and I don't want to switch to something else. But if this problem persists I'll have to.

Any chance to get this fixed?