I tried some examples from the Processing site itself and got to this problem:
I'm running on a 64-bit computer with 64-bit Java and tried the code of this page: http://www.processing.org/learning/basics/primitives3d.html

Now I got this error in the console:

1. #
   # A fatal error has been detected by the Java Runtime Environment:
   #
   #  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0000000058d1a349, pid=9116, tid=6644
   #
   # JRE version: 6.0_33-b03
   # Java VM: Java HotSpot(TM) 64-Bit Server VM (20.8-b03 mixed mode windows-amd64 compressed oops)
   # Problematic frame:
   # C  [atio6axx.dll+0x17ea349]
   #
   # An error report file with more information is saved as:
   # C:UMSIDownloadsprocessing-2.0b6-windows64processing-2.0b6hs_err_pid9116.log
   #
   # If you would like to submit a bug report, please visit:
   #   http://java.sun.com/webapps/bugreport/crash.jsp
   # The crash happened outside the Java Virtual Machine in native code.
   # See problematic frame for where to report the bug.
   #