wierd cutoff? plz help

wierd thing ive seen yet.
everything i render just gets cutoff about halfway down the screen. nothing above the top half of the screen is seen. its like there is a big invisible barrier there or something. i have no idea what this is a result of, so hopefully someone here does, thanks

Your clipping plane is the problem. How do you setup your projection/view matrix, and all that good stuff? Do you use ortho, perspective or what?

might be viewport prob too…

ok, here is what i do:
void glApp::AppResize(GLsizei width,GLsizei height)
{
if(height == 0) height = 1;

glViewport(0,0,width,height);

fAspect = (GLfloat)width/(GLfloat)height;

glMatrixMode(GL_PROJECTION);
glLoadIdentity();

gluPerspective(90.0f,fAspect,0.1f,450.0f);

glMatrixMode(GL_MODELVIEW);
glLoadIdentity();

anything look wrong to you?