I cannot figure out what's wrong. I use this code
Code:

---

 // test.wdl

string str_level = <test.wmb>;

view camera2
	{
	pos_x = 0;
	pos_y = 0;
	layer = 1;
	size_x = 200;
	size_y = 100;
	flags = visible;
	}

function toggle()
	{
	camera2.visible = !(camera2.visible == on);
	}


function main()
	{
	on_t = toggle;
	level_load(str_level);
	camera2.clip_far = 1000;
	} 

---

I have also compiled the level in a redistributable program. Can I mail it to you to reproduce the problem with my engine version (6.31.4)?