Try placing a spawn brick above the interior and see what happens, on one of my For Fun maps the spawn brick refused to work because it was surrounded by interior hills.
Yeah that works.
And i recently found the problem.
Apparently, I had a glitched brush that was NULL and stretched across the interior area.
But I'm still wondering WHY the game forgets up when i left something in here like that?
I need answers D;
Just in case this happens again, and it's not the same fix.
Because, I'm quite positive that my "fix" was coincidental.