[SDL] Fadeout effect when switching modes in fullscreen on OSX

[Stephen Anthony]

First of all, has anyone seen this effect before?  It occurs in 
fullscreen mode in OSX, when one does a mode change.  Instead of the 
quick change that occurs in Linux and Windows, the whole screen fades 
out, and then back in again.  I assume it's an OSX/SDL thing, since the 
same code doesn't do that anywhere else.

What is this effect, and is it possible to disable it?  Or do the users 
have to live with it?  I ask, since the project I'm working on (an 
emulator) has a built-in debugger, and switching from emulation mode to 
debugger is slower than necessary, especially when one is developing a 
game.

Thanks for any info,
Steve