Not sure this is really a bug, probably just a preset limit, but anyway...

Problem: whenever MS Agent reads a long line, it's cut short at 350 characters.
mIRC version: 6.03.
How to reproduce: go to channel Teen on IRCnet. The welcome message (see below) stops after "#funfact".

-Schatzi- Welcome to #teen, BeauNoddi. This is an international channel. Be nice and respect others. Speak in ENGLISH only. Absolutely NO begging for op, invites, advertising, repeating, trouts, porn, channel ctcps, flooding, excessive cussing. Don't write all capital letters. Enjoy your stay. These rules also apply for channels #chatzone, #funfactory, #teens and #ircbar, try them too!