Try disabling the safety on the RobotDrive with
Code:
drive.setSafetyEnabled(false)
This is the timeout between updates of the RobotDrive. It really isn't super important to keep it enabled, but if you want to enable it, then try timing your code and set the timeout longer than the loop that is calling arcade drive.
About the RioLog, anything printed to stdout or stderror will appear in the log.