Hi Doug.
FYI, the information provided on this forum is 99.9% fan-generated (the developers stopped visiting a couple of years ago). So if you want to send a question directly to the devs use the form you'll find in the "
About" tab (up top).
Or, try the advice forum contributor Nathanoj gave to solve "mouse control" problems in Windows 10 (hopefully this fix will improve "touch control" as well):
1) Right click on the Machinarium desktop icon (or find the .exe file)
2) Click Properties
3) Open the Compatibility tab
4) Check the box under settings which says "Disable display scaling on high DPI settings"
5) Press OK.
Hope this helps.
~Alex