Why does the scrolling function not work anymore?

A possible reason is when both features "Talk Back" and "Explore by touch" are activated.

To restore the scroll function "Explore by touch" must be deactivated.
Please perform the following steps.

 - Menu
 - Settings
 - Operating aids
 - Explore by touch -> OFF

Note:
- Double touch all touch points
- Scroll in the menus with two fingers simultaneously