Maybe its a "whitespace name". I remember it was a trend to use an empty name at Instant Messengers like MSN a few years ago. To get a whtiespace name, you can type name [ALT+0160] (Press alt, then the number sequence).
Annoying, not sure if that's your problem but you can kick people by ID. Type status and you'll see if there is a person "without" name. The command kick the numeric #id of that person would do for this.
Annoying, not sure if that's your problem but you can kick people by ID. Type status and you'll see if there is a person "without" name. The command kick the numeric #id of that person would do for this.