I get an 'Invalid memory access of location' error with even the most basic sketch using both.  But I haven't found any other evidence of this on teh interwebs, so maybe someone can help me out.  

2. import processing.serial.*;
3. import processing.opengl.*;
4. 
   
5. Serial myPort; // the serial port
6. 
   
7. 
   
8. void setup() {
9.   
10.   size(1000,750,OPENGL);
11.   background(255);
12.   
13.   println(Serial.list()); 
14.   myPort = new Serial(this, Serial.list()[0], 9600);
15.   myPort.bufferUntil('\n');
16. }
17. 
    
18. 
    
19. void draw() {
20. }
21. 
    
22. void serialEvent(Serial myPort) {
23.   background(255);
24.   println("serial");
25. }

Changing the OPENGL to P3D allows the sketch to run fine.  Thanks in advance for any help.

-b