I can confirm, that with todays update the issue with not being able to scroll on web brower view has been fixed for my XB360 controller and the keyboard on my system.
Thanks for the feedback @Juppstein.
Closing per the last comment and "Fixed page scrolling in web browser" in the 2018-09-26 Steam client beta.
Nothing extracted yet.
Your system information
Please describe your issue in as much detail as possible:
Scrolling up or down in Steam BPM Browser is not possible anymore with either keyboard or XBox 360 controller. When exiting the browser and going to regular menu driven UI (i.e. Shop, inventory, etc.) The joystick used for scrolling will act like arrow keys and navigation is possible.
I already tried to load the default config of the controller, but that did not fix the issue.
Steps for reproducing this issue: