I never had any problems with the slide bar either.... Apart from the dissapearing trick that they love to frustrate us with but Microsoft then subversively infiltrated my laptop while i was out in the garden and without my permission downloaded Windows
10 on to it. Watch out for it. Theres a box that comes up and tells you that W 10 will be downloaded in x amount of minutes and a timer starts counting down like a ticking time bomb.
Of course if your not at the laptop when this happens then the bomb will go off and when you come back its already downloading/ed. I'd like to know what would have happened if my laptop wasn't connected to the mains and the battery had died half way through
the download or if I'd closed the lid wthout noticing. Dead computer?
Anyway I come back from my little foray out in to garden to find my laptop upgraded to windows 10. Didn't ask for it.. Didn't want it but there it was, so after some research on tinternet, I see that I can downgrade it back to 8.1 within 31 days so I think
well if I'm being forced to beta test it for them, what's to lose from giving it a try for 2 or 3 weeks?
Pretty soon I realise that its unstable and many programs run slower than they did before.
Then, coming to your problem, I start having trouble with scrolling. Pressing on the up and down cursors resulted in scrolling too fast, so having to constantly readjust up and down... Very frustrating. Then to add to my frustration, while trying to use
the slider bar in the hope of that being easier, it starts to freeze up and becomes virtually unusable.
So desperate are Ms for us to use this broken piece of ****, that they actually download it on to your computer while your not looking :)
If I were you I'd think about following my example and roll it back to you previous OS. If your able to of course. Windows 7 is better than W10 in my opinion (at least its stable) . Its either that or wait for some indeterminate length of time (weeks..months..years?)
for updates that will make it work properly.