Recently I stumbled upon a problem that seems to be affecting a lot of people, while we found a quick solution I’m not sure why the program would behave this way. Basically when you’re sculpting a Landscape the drag function (ctrl+lmb) stops working and the power of the sculpt (single clicking) is greatly reduced, it seems to work properly when you only use 1 viewport or maximize the working viewport.
I have entered a bug ticket, this is most definitely not expected behaviour!