Hi, after lots of research I copied the RXTXcomm.jar and libRXTXSerial.jnilib from the Arduino package into the Processing package library locations and also onto harddisk/Library/Java/Extensions, then I opened the permissions for lock and spool folders under /var/ to read &wrote for everyone. Here is the error I get, with some code leading up to it. I'd appreciate any suggestions, as I am totally out of options now!