okay guys I rescripted it for you try this

Code:

---

 
var video_mode = 8;
var video_depth = 32;

string level = <level.wmb>;

font simple = "arial", 0, 30;

var a = 0;
var b = 0;
var c = 0;

panel addition
{
pos_x = 0;
pos_y = 0;
digits (35, 10, 4,simple, 1, a); 
digits (35, 19, 4,simple, 1, b); 
digits (35, 28, 4,simple, 1, c); 
flags = VISIBLE; 
}

function main
{
while(1)
{
c = a+b;
wait(1);
}
}
 

---

try again now should work
regards
Aztec