Comment by jussi.ao.malinen: Interesting. Thank you for the report!
It seems that the robot imports the random.py from your local python 2.6 installation instead of from inside the JAR package, where the correct version for jython is.
If you remove the PYTHONPATH environment variable, you most likely can then run the jar also on Windows.
I will take a closer look at this at the beginning of next week. For more information: http://code.google.com/p/robotframework/wiki/JavaIntegration
