This link has a video tutorial for how to download code to the robot and convert the arcade drive to tank drive.
http://users.wpi.edu/~bamiller/Using...iveSample.html
We actually were freaking out because we thought a library was jacked up.
After much thought I came to the solution that Windriver was repetitively loading the first code we set the preferences for.
This process of setting the preferences can be seen in the tutorial above better than in the FRC Programming Guide.
NOTE: this is for if you are having problems where the old code is still running but the new code is not
ie. the code said tankdrive clearly but the robot was running arcade.