I've tried the 1.3 and 1.2 Gcode interpreters with the Reprap Host and Replicator G with no luck now, as well as Arduinos 10 through 12.. the system dump from the command line when running the Host software says

C:\Program Files\RepRap>rem reprap-host -- runs Reprap Java host code with an ap
propriate classpath

C:\Program Files\RepRap>rem Amount of RAM to allow Java VM to use

C:\Program Files\RepRap>set RAM_SIZE=384M

C:\Program Files\RepRap>rem reprap.jar file and stl file

C:\Program Files\RepRap>set REPRAP_DIR=C:\Program Files\Reprap

C:\Program Files\RepRap>rem Java3D and j3d.org libraries

C:\Program Files\RepRap>rem set JAVA_LIBRARY_DIR=C:\Program Files\Reprap

C:\Program Files\RepRap>rem cd so we can find the reprap-wv.stl file. Can we av
oid this??

C:\Program Files\RepRap>IF NOT EXIST reprap-wv.stl cd "C:\Program Files\Reprap"


C:\Program Files\RepRap>java -cp ".\reprap.jar;.\RXTXcomm.jar;.\j3dcore.jar;.\j3
d-org-java3d-all.jar;.\j3dutils.jar;.\swing-layout-1.0.3.jar;.\vecmath.jar;." -X
mx384M org/reprap/Main
Stable Library
=========================================
Native lib Version = RXTX-2.1-7
Java lib Version = RXTX-2.1-7
Error opening port: /dev/ttyUSB0
-- /C:/Program%20Files/RepRap/rr-logo-green-url.png
bufferQueue: attempt to queue: G1 X-999 F1600.0 ;home x to a non-running output
buffer.
bufferQueue: attempt to queue: G92 X0 ;set x 0 to a non-running output buffer.
bufferQueue: attempt to queue: M105; get temperature to a non-running output buf
fer.

Looks like you are running on Windows but you have the port set to a Unix device. It should be something like COM1. You need to change port(name) in the global preferences.

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[www.hydraraptor.blogspot.com]

Thanks Nophead!