I am well aware of that issue, as I have been using old version of mirc for long time. That was the part of the reason in moving to newer mirc so I don't have to deal with all that encoding issues.

This problem has NOTHING to do with euc-kr or utf-8 encoding issues.

This is really odd bug where I cannot make/join a channel with specific characters.

To clarify any misunderstanding, for Example:
If character "N" was the bugged character, then I cannot make or join channels like "#SomeName" because it has character N inside the channel name.

edit: btw, congrats on your 2k smile