Need areaportals help
Have some troubles with my "func_areaportalwindow"
So, why this crap shows up?
Somehow you don't have a good material on it, so it's not hiding the fact that it's closed (the leak-y stuff).
Make sure you have:
- no areaportal leaks (and, no ordinary leaks for that matter);
- set appropriate fade start / fade end distances in the areaportalwindows's properties;
- as Felix suggests: a separate (non-solid) func_brush with an opaque material, covering the opening;
- set the "rendered window" property of the areaportalwindow to the name of that brush.
That's all I can think of ATM 
Other Portal 2 maps: Medusa Glare
Portal 1 maps: Try Anything Twice | Manic Mechanic
If your areaportal is set to closed, it will do this.
[spoiler][SP] Alternate[/spoiler]
Try this page from the wiki: https://developer.valvesoftware.com/wiki/Area_portal
It discusses using an area portal window. Follow the advice there and you shouldn't have this problem. You should make sure you read the compilation section as it has advice related to your issue. https://developer.valvesoftware.com/wik ... ompilation