From: Derek Lee-Wo on
> this is most probably an assert/error message trying to make itself heard,
> you could try to see in the debugger what the error might be ...

I was running a release build and from what I can tell from the docs,
the asserts shouldn't be happening. Anyway, I also tried a debug
build and unfortunately the debugger doesn't show anything.

I also stepped through the code all the way leading up to the call to
ShowModal() and it all looks good until then, but once I step over the
ShowModal(), the dialog displays and then I get the blank message
window.

Can I assume then that displaying a modal dialog in the main frame
constructor is *supposed* to work in wxMac?