Mac exports not working on MacBook Pro

Hello, thanks for your software. I am having trouble on an OSX machine using version 1.4.
Making a small test file - one actor on a blank background.
Game Editor works, and Game Mode works as expected.
When I export to a Windows .exe that works OK on a Vista machine.
Export to OSX app, when made into an executable opens a blank window and freezes.
This blank window is always the full width of the screen, not the requested game window size.
It has to be force quit, ESC doesn't work. There's no crash report.
The machine is an Intel Core 2 Duo, running 10.5 (Leopard).
Thanks for any advice you may have.
Making a small test file - one actor on a blank background.
Game Editor works, and Game Mode works as expected.
When I export to a Windows .exe that works OK on a Vista machine.
Export to OSX app, when made into an executable opens a blank window and freezes.
This blank window is always the full width of the screen, not the requested game window size.
It has to be force quit, ESC doesn't work. There's no crash report.
The machine is an Intel Core 2 Duo, running 10.5 (Leopard).
Thanks for any advice you may have.