It seems that mIRC is updating the value of $me before it executes the on NICK event.
on *:NICK:{
echo -a Me: $me
echo -a Nick: $nick
echo -a NewNick: $newnick
echo -a Raw: $rawmsg
}
Me: [color:green]NickA[/color]
Nick: [color:blue]NickB[/color]
NewNick: [color:green]NickA[/color]
Raw: :[color:blue]NickB[/color]!ident@host.com NICK :NickA
I'm guessing that the "me:" prefix is essentially this code:
if ($me == $nick) ;execute event
But since $me has already been updated to the value of $newnick, it no longer matches $nick (obviously).
-genius_at_work