Cursor up/down to scroll feed doesn’t work in story view (webpage).
Check Manage > Preferences > Keyboard to configuration. You must be a premium subscriber to change those keys, though.
I’m a premium user and know of that option. It does work when view mode is “Text” or “Feed” but not when set to “Story”. Testen in different browser on Windows and Mac.
That’s the one I use, but it just doesnt work in Story view.