About freezing, I know this.
It happens every time, when I run a script after playing several 3d games based on different engines.
Maybe it's because computer needs time to initialize new engine.
Screen gets black, but computer shows that its working about something - if I run a task manager before, perfomance diag shows maximum activity for those 4-7 seconds.
About fullscreen - try this:
Code:

video_window(nullvector,nullvector,1,"myApp");
video_switch(8,0,1);

this normally works.

I switched to other account since marth 2010. Guess which.