Dialogs in unicode dll's

[Anonymous]

I have a legacy application built with 2000 ObjectARX and MSVC6 MFC that I need to convert to unicode. When I define _UNICODE and make the necessary changes for the code to compile, I can no longer create dialog boxes. The app uses standard MFC dialogs, not AdUi or AcUi. I made a minimal, do-nothing dialog for testing and still have the problem. OnInitDialog runs correctly, but then I get an Access Violation Reading 0x0000. Do I need to do something special in the initialization code to support unicode? Am I missing something? Thanks, David