What's the problem exactly? It looks like the problem was the auto-hide feature that was enabled, if those people turn off the auto hide setting for all windows (as stated previously in this post, they might want to delete the whole [nicklist] section in mirc.ini, but I'd suggest they try with a complete new install of mIRC), doesn't that resolve the issue?
sometimes two lists appear but are all buggy not useable but if you go into another room its ok
If you cannot reproduce the problem, ask the people to install mIRC in a new directory without loading any script, see if they can reproduce the problem.
