mfc, Can you call SetWindowText on a modal form?

1. Can you call SetWindowText on a modal form?

Hi
I have a DLL that is called by Visual Basic and which 
displays a modal form. I have compiled this DLL and it 
works perfectly, apart from the fact that I want to be 
able to pass it a string to display in the title bar, but 
the SetWindowText function doesn't seem to do anything.
My code is shown below. Any help would be much appreciated.
Thanks

void __stdcall GetLogin(BSTR appname, BSTR caption, BSTR* 
username, BSTR* password, bool reshow)
{
	//read the current username from the registry for 
this application
	CString currentuser = theApp.GetProfileString
((LPSTR)appname, USERNAME, NULLSTRING);

	//read the current password from the registry for 
this application and decrypt it
	CString currentpassword = Encrypt(
		theApp.GetProfileString((LPSTR)appname, 
PASSWORD, NULLSTRING));

	//variables to represent new password
	CString retuser, retpass;
	if(reshow || (currentuser.GetLength() == 0))
	{ //if we need to show the form because either 
there is no existing username or because we are told to...
		Login flogin;
		
		//update the caption of the form
	
		flogin.SetWindowText((LPSTR)caption);
//THE ABOVE LINE DOESN'T DO ANYTHING...

		//show the form modally
		flogin.DoModal();

		//retrieve the values entered
		retuser = flogin.m_Username;
		retpass = flogin.m_Password;

		//update the registry settings for this 
application, after encrypting the password
		theApp.WriteProfileString((LPSTR)appname, 
USERNAME, retuser.operator LPCTSTR());
		theApp.WriteProfileString((LPSTR)appname, 
PASSWORD, 
			Encrypt(retpass).operator LPCTSTR
());
	}
	else
	{
		//if values already exist in registry, 
just set return values to these
		retuser = currentuser;
		retpass = currentpassword;
	}

	//copy return values to byref parameters passed in
	LPCSTR luser = retuser.operator LPCTSTR();
	LPCSTR lpass = retpass.operator LPCTSTR();
	*username = SysAllocStringByteLen(luser, 
retuser.GetLength());
	*password = SysAllocStringByteLen(lpass, 
retpass.GetLength());

}

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I have localized this dialog and text in English, French, German, Japanese, Korean, Simplified Chinese, and Traditional Chinese using individual resource files for each language.  The text shows up fine in all languages except Japanese.  In Japanese, the window title bar text shows up with the correct multibyte characters, but the window text shows up with ASCII characters (i.e. punctuation) fine but all the multibyte characters are replaced by either spaces (native Japanese) or black rectangles (MUI).  I have dumped the text in question to a log file and it displays fine, so the text is being retrieved from the resource file and formatted correctly.  I can even write that text to the window title bar and it displays correctly; it is only when I write it to the static controls that it gets messed up.  I am thus thinking that I am running into an ATL bug, since I have written a test program using an MFC dialog reading from the same localized resource file and it works fine on Japanese (native and MUI).  I am using Visual C++ 6 SP4.

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