User registers an account and his password contains special symbols like this N123#456789 (grid symbol)
after that, in log file (infolog.0) appears such string:
20090717 22:08:03.469 SENT: /comm CH%7c%2fregister+UserName%2cuser%40email.com%2cN123%23456789
where UserName is user name =)
email@example.com - is his email and
N123#456789 is what he entered as his password.
Instead, he is registered in database with password N123, all other symbols are lost somewhere. Is is very annoying string parser bug, lost about half an hour myself, to understand, what had happened.