So I'm in TextEdit. I must have bumped a key because I was away from where I was last time. No problem, I'll use page up. I've used an iClever BK-10 and I'm now using an Apple Magic keyboard. In both cases, though fn-up is reported as page up, it doesn't seem to do anything. The cursor doesn't move. I've interacted with the text in the editor. Luckily home and end seem to work, but it's really weird that pgdn and pgup don't seem to move the cursor at all, anywhere that I've found so far.
Am I missing something? Or does Mac just not use these keys for anything?