Thanks Ryan. Sadly no demo available. I have just installed rc5 of XQuartz but it made no difference (same black window). Just to check I'm doing it right, do I just install the XQuartz package then do this: $ cd ~/.wine/drive_c/Program\ Files/BOH/ $ /Applications/Darwine/Wine.bundle/Contents/bin/wine BOH.exe Is it worth trying the final XQuartz 2.3.3, or is it unlikely to make any difference?