You are unlikely to see the cube because the camera is only 100 from the origin and the cube (centred about the origin) is of size 600 and the noFill means you will only see it as wire frame.

The code below is a modification of your own. I tested your code and mine on a Mac with Processing V2.0b6 and PeasyCam V1.05 and both worked without error.

Make sure you are using the latest versions of Processing and PeasyCam and if the error persists then I suspect the problem is related to the OpenGL drivers for your graphics card which may want updating.

1. import peasy.test.*;
2. import peasy.org.apache.commons.math.*;
3. import peasy.*;
4. import peasy.org.apache.commons.math.geometry.*;
5. 
   
6. PeasyCam jCam;
7. 
   
8. void setup(){
9.   size(600,600,P3D);
10.  
11.   jCam = new PeasyCam(this, 100);
12.  
13. }
14. 
    
15. void draw(){
16.   background(0);
17.  
18.   stroke(255);
19.   noFill();
20.   box(600);
21.  
22. }

Solved! It was a matter of the drivers.

Thank you very much! I really appreciate it