Steam version: "a" doesn't work at all.
I download newest (54) version and started game with my almost 30 level dark elf paladin.
When I hit "a" to get to my skills I get that:
Which skill ([123] Quick select -[*] Choose - [Z ] Abort)?
And here nothing works. Only with spacebar I can get out of here.
And of course here we see also [Z ] instead of [Z].