If you install mIRC to your "Documents" folder in Windows, using the "Portable" option in the installer (this will make sure that it does not use/affect your current settings) and then run mIRC from that folder, do you still see the same issue?
Alternatively, if you try the beta version of mIRC (see the "mIRC Beta" link at the top of the "Bug Reports" forum), does that resolve the issue for you?
