I have been facing this issue from the day one since I installed Windows 10 on my laptop (Dell XPS L502x).

Native Windows Applications like all browsers, office products etc. anything that is not from the Store, works fine. I can use Touch Pad scrolling with no trouble. e.g. on Internet Explorer, Chrome, MS Word, etc.

But the apps that come out of store or the apps like those which come pre-built with Windows 10 such as new Settings UI, Microsoft Edge. Touch Pad scrolling just don't work with these apps. When I perform scrolling the scroll-icon appears but doesn't scroll the content.

This issue is only with Touch Pad. External Mouse works great with scrolling on any kind of app.

Hope to find a solution here.

PS: drivers are all good on the machine and up to date with no warning or error.