Hey, thought I'd try our collective knowledge :)

I'm using layers as in this post, i.e.:

but when I hold the MO(1) button, the "a" button doesn't do anything.. qwesdzxcv just fine, but not the "a"... while that button works just as intended on layer 0.

What could this be?

I'm using Vial for the keymap config, if that helps. Thanks for your thoughts!