See above Q:
Are you using the latest version of mIRC (v6.16)?
Hmm, turns out I'm still using 6.12.
Kthx. =)
/edit
Oh, hmm, still something to ask: the quit-message that someone uses, how can I spawn it using a variable? (like $nick for the nick)
/edit2: how can I still catch the user's [email]user@host[/email] address when using it in that quit-script? It just shows blank while there should be the same as joining.