Well, the aliases appear to be fine. Have you looked to make sure you don't have any {} mismatches? That would be the only thing I can think of.
The strange thing is that if I don't have those aliases entered and I try those echo commands you gave, I don't get the no such identifier errors. Instead, I get insufficient params for echo. (v6.2)
EDIT: You could also make your IF statement just see if $qt is valid rather than checking the version, if you wanted. if ($qt(a)) ... if it's valid, then you know $qt is available to use. Otheriwse, it would be $null and you'd know $qt wasn't available. Not really a big deal, but it does save a few characters.
