Yes. This always happens to me... every time I post a bug, people ask me about temp ^^.

That's why I mentioned it up above.

The line that really crashes is:
darkenPan.size_x = screen_size.x;
But to try and see if darkenPan was the issue, I replaced it with this:
sys_marker("ds2");
temp.x = screen_size.x;
sys_marker("d02");

And then I got a crash in ds2.