Thanks so much again!
I have been trying in my setup but no luck for me. My setup is described below… I will keep on fighting and reporting so that anyone else can save time. Some more questions to everyone:
Is the connection type involved on the trick? HDMI, DVI, VGA…
Other settings in Blender that could interfere? fullscreen, GLSL vs Multitexture…
Does it have been tested under Win Mac and Linux?
None of this setups has worked …
A:--------------------------
MacBook Pro Intel Core 2 Duo 2,8GHz
Nvidia GeForce 9600M GT
Mac OSX 10.6.7
Blender 2.57b
Projector Viewsonic Pro8500
B:--------------------------
MacBook Pro Intel Core 2 Duo 2,8GHz
Nvidia GeForce 9600M GT
Windows 7 64 bit
Blender 2.57b
Projector Viewsonic Pro8500
C:--------------------------
Intel Core Quad Q9000 2.50GHz
Nvidia GeForce GTX 470
Windows 7 32 bit
Blender 2.57b
Projector Viewsonic Pro8500