Unable to Launch in Window Mode

Hi,

This might be a cross post with a post i did in the TGB forums, i hope no one gets angry about it, it just seems that it goes well in both forums.
I'm unable to make my TGB game work in Window mode in a laptop running a x2300 ati mobility.
I launch the game in full screen, and when i change it to window mode it does everything as it should to change to window mode, but then it just stays in the task bar doing nothing. Clicking on it to wake it up, doens't work either.
This code is working in many other machines, except in this one.
Do you guys have any idea why is this happening ? Any clue ?
%sucess1 = setDisplayDevice("D3D", 1024, 768, 32, true);
%sucess2 = setScreenMode( 1024, 768, 32, %full_screen );

Both functions return true, so the video changing is being sucessefull, but it seems the game is not waking up.
And because setScreenMode is returning true, I have no way to know if a user was sucessefull in doing this.
Any ideas on how to fix this, or some work around ?
thanks,
Bruno