As Ruud discovered, trying to use 3DSimEd in OSX results in a
black screen -- I just had a look at this, and I believe this
is related to the level of OpenGL support currently available
in OSX ... if the rumors are correct that OSX 10.7 is going to
have OpenGL 3.0 supports, I'd be hopeful this program would do
better here ; right now though on OSX it's not seeing any of the
OpenGL attributes it requires, hence the black screen...