Same issue for me in Elantech touchpad. Probably the new features "HorizHysteresis" and "VertHysteresis", added with 1.5.99.901-1 version, cause the issue. Setting "VertHysteresis" and "HorizHysteresis" to "0" don't have effects. The scrolling is very unusable. I don't know how investigate more.
Best regards.Matteo.
