PageUp and PageDown stopped working at all after migrating to new MacBook

[roelvangils]

I used KeyboardScroller on my previous MacBook (M1) and it worked very well. However, when I recently bought a new MacBook (M2) and had all the settings transferred over, I forgot to install Keyboard Scroller again. I do think some of the settings were transferred, because my PageUp and PageDown keys no longer worked at all. So I have reinstalled KeyboardScroller, but still the keys don't work. What's even crazier, if I press any of the keys, it doesn't scroll, but I can no longer enter text in the active window either. Only after pressing cmd+tab (back and forth) it works again.

Now of course I'm not sure if it's because of KeyboardScroller, but reinstalling it doesn't work either. So I need a little help in debugging what actually going on.In the first place, I would like to get my PageUp and PageDown working normally again, but of course I would also like to be able to use the excellent KeyboardScroller app again.

My key events look like this, according to Karabiner EventViewer:

[
  {
    "type": "down",
    "name": {"key_code":"page_down"},
    "usagePage": "7 (0x0007)",
    "usage": "78 (0x004e)",
    "misc": ""
  },
  {
    "type": "up",
    "name": {"key_code":"page_down"},
    "usagePage": "7 (0x0007)",
    "usage": "78 (0x004e)",
    "misc": ""
  },
  {
    "type": "down",
    "name": {"key_code":"page_up"},
    "usagePage": "7 (0x0007)",
    "usage": "75 (0x004b)",
    "misc": ""
  },
  {
    "type": "up",
    "name": {"key_code":"page_up"},
    "usagePage": "7 (0x0007)",
    "usage": "75 (0x004b)",
    "misc": ""
  }
]```

[roelvangils]

Oops, here's an update: it seems that Swish is the culprit. KeyboardScroller and Swish don't seem to like too much 🙂 If I disable Swish, the keys work again like normal.