I can say with 99% certainity that's not a mIRC issue. Rather, I believe it's something in the bamahut source that it only affected randomly, and only on certain OS setups. I've seen this same think with Unreal, and it has little to do with the command you're using at the moment. I've ran a ton of servers on my net and every so often I will come across one with that issue. I have one now if you care to sit on it for a few hours (/server Spicy.WyldRyde.Net). This machine is a redhat 9 box and I've seen this same thing on a FreeBSD system, so it's not OS specific neither. I've yet to even have a clue where to nail it down at.

Cheers,
GregMo