Well, welcome to the mIRC message board!
Along with the good advice given above, it might be worth mentioning that these boards have a
Search feature. If you expand to 'All Forums' and expand the date range to 'All Posts' then you will get better results when using it. Obviously, many topics have been covered before and it's always worth running a couple of searches on different search words to make sure your problem hasn't been covered before, even if it's something obscure.
Personally, I would suggest you upgrade to mIRC 6.12 (this has nothing to do with your /list problem btw), as 6.03 (And other versions) have a known exploit in them. It's always a good idea to keep up with the latest software versions for *all* your programs on your computer for maximum security. I know you're not new to mIRC, so I would imagine you're perfectly aware mIRC 6.12 has been released, but I thought I'd suggest it anyway
Happy chatting!
Regards,