Arrow keys not working in After Effects

I'm having a really strange issue with After Effects. For some reason, the arrow keys on my keyboard don't work correctly anymore. I can use them to nudge layers position on the canvas, but anytime I use them to navigate within a text field (like when naming a layer, or editing an expression) they no longer work. If I have text selected, typing any of the arrow keys deletes the text. If I have the cursor somewhere in the text, the arrow keys do nothing. It's VERY frustrating.

Is anyone else experiencing this?

I've deleted my preferences to see if that might be the issue, but no. I've restarted several times and the problem persists. I'm pulling what's left of my hair out here!

Any ideas?

Thanks!