In the Touch Screen, when Slider set property "IsMoveToPointEnabled" to True, it is difficult to slide by press Thumb, it‘s not display on WPF. By the way，it is default style, and i test it on XamlPlayer,

We are working in a new theme for the next major version that should me more compatible with touch screens. Meanwhile you need to modify your theme to suit your needs. Could you also paste a screenshot here showing your issue?