If you mean that you cannot see the characters in the editbox while you are typing them, there is little mIRC can do about that. mIRC depends entirely on the Windows richedit control for text input. mIRC v7.0 uses the latest version of richedit, msftedit.dll, for better Unicode support, however the editbox has its limitations. In fact, if I paste the same text into the Internet Explorer address editbox, it also displays boxes for those characters. Firefox displays the characters correctly though, so they are probably using their own display method.

That said, mIRC is displaying these characters correctly in the text display of the window for me. In this case, mIRC is using its own routines to display text that are independent of the editbox.