Thanks for the bug report - I am not sure why that would happen - the editbox is a richedit windows control and displays text without any intervention from mIRC.
mIRC 7.0 will be using either msftedit.dll, which is the latest version of the richedit control, if it is available or riched20.dll if not.
I would prefer to continue using msftedit.dll since it has better support for Unicode, however if it turns out to be problematic I may revert to riched20.dll.
Is your Windows default language English or something else? Is your version of Windows XP fully updated to SP3?
Update: I have not been able to reproduce this, however I think I may know why it is happening. I will make a change to the next beta and we can see if that resolves the issue for you.
Last edited by Khaled; 03/04/10 12:57 PM.