TOTALLY UNACCEPTABLE!!!
My Surface Pro 4 was just updated to the Fall Creator's Update for Windows 10, and it seems to have broken its own Pen, at least with Clip Studio Paint. After a few quick pencil strokes, the SP4 will now register that I want to move the canvas instead of making a new line.
I've just discovered this annoyance and tried a few things to see if there's a fix, but nothing yet. If someone else has some tips or suggestions about this problem, let me know!
UPDATE: After doing some more troubleshooting, it appears that the issue affects my copy of Manga Studio, but not an earlier version of CSP I also have installed on the SP4. So I guess it's back to CSP version 1.6.2 and forget about 1.6.7.
UPDATE 2: Upgrading to CSP 1.6.8 fixed the issue for me. I suggest downloading and trying it out. It doesn't overwrite your old versions of MS or CSP, so make sure you're on the correct version to see if it solves the problem.