AdiIRC

Per Amundsen wrote:

Is this something new to 2.5 ?

Also on what network(s) does this happen?

To my knowledge, I haven't noticed it happen on 2.4 and as such it appears new to 2.5, but due to the nature of the bug I may have simply not noticed it before this version (I see roughly a year ago someone reported a similar issue on a different version. Issue #2066). Also, the only network I've myself noticed the bug on is irc.justtrance.net . It was a hard issue to catch, since it's inconsistent user to user; I only noticed when a certain user appeared logged in for over 24 hours (where they typically log off each day).

It is possible for the Nicklist to go slightly out of sync during netsplits etc, but the messages should always be shown even if they are not in the Nicklist, you can actually test that using /fakeraw :fakenick!fakeident@fakehost.com PRIVMSG #channel :test.

You can try keep Menubar -> File -> Rawlog open, whenever you determine a nick is not removed, go to Rawlog and select the irc.justtrance.net network in the Sidebar, then press the search button for the nick, and see if you can find the last QUIT/PART/KICK message for that nick, then either paste it here or email it to me at amundsen@gmail.com along with the exact nick casing and or channel modes in the Nicklist.