This one is simple, so I can be short (you lucky people).
Using the in-built irc-chat, if you paste a magnet link it gets cut short, rendering it useless.
Magnet links via DC++ seem to work fine (I assume it uses the same irc framework).
Maybe it's a word-wrap issue ? or max line-length before splitting ?
In Trillian IRC it allows 3 options for compatibility, you may need to just change a switch/value (hopefully).
I have been trying to promote Shareaza as a convenient way of setting up your own group, for working on communal projects, but that test fell a bit flat