Ooh, didnt see that on Bubbas before, I love that site.
Whoopsies.
EDIT:
After seeing Bubbas, and comparing it against mine, I could not find anything wrong.
However, the one thing that could possinbly be wrong is the screen's texture.
In the Common shader directory, there are 2 options for portal shaders:
portal
qer_portal
which should I use, Ive tried them both though, is there any options I should be compiling with, wuill a simple .bsp suffice?