The Framework this year behaves a little differently than last year. There is a new type of "Watchdog" hidden within the Arcade/Tank/Holonomic Drive vis.
It's optional, but enabled by default.
If you want to change it (enable/disable) you do so in Begin.vi inside the Open 2 Motor or Open 4 Motor vis.
The way it now works is the drive motors will shutdown if you don't call Arcade/Tank/Holonomic Drive within every .1 seconds.
It is no longer "set it and leave it"
If you suffer from this you will see this error message on the Diagnostics tab error window:
ERROR <Code> -44061 occurred at "Left and Right Motors" in the VI path: Robot Main.vi
<time>23:15:45 01/21/2011
FRC: The loop that contains RobotDrive is not running fast enough.
This error can occur if the loop contains too much code, or if one or
more other loops are starving the RobotDrive loop.
If you think you code should be setting the Drive quickly every iteration, then you may have sluggish code of a long loop that is keeping you from leaving the vi.