I primarily use "Arial Narrow" - which shows no "block" when using ctrl-u aka $chr(31) to underline text - on an XP system. I suppose it's only up to the charset of one's font...
Edit:
Thinking it over again; I don't remember I ever "saw" a ascii 031 on my machine so far, whatever font used.. but never I regarded this a bug.
Maybe someone can explain the cause for this (pointing out it's not (only) a vista-issue)
