No Robot Code error

[CFrank13]

For the upcoming fall classic FRC competition, our team did our first power-up check today. The test ran smoothly and everything worked fine. After turning off the robot and then turning it back on, without re-downloading code or changing anything on the robot, the driver station displayed "No Robot Code" and would not run. This program is the exact code that we used last FRC season, and was confirmed to be operational. Because it worked today and then suddenly stopped working without any apparent cause, this is a list of troubleshooting solutions we have tried so far:

Software Tests:
-Run full program (which was just working a moment ago)
-Run program with complex/potentially breakable functions commented out
-Run empty workspace (hello world)
-Run code from previous years (2012, 2013)
-Check Driver Station Launch Viewer
-Re-Install latest FRC WindRiver C++ update
-Re-Install latest WPILib update
-Re-Install latest National Instruments update

Firmware Tests:
-Run code on new cRIO
-Re-image cRIO with latest image (2014)

Hardware Tests:
-Unplug/replug ethernet cable
-Use new ethernet cable
-Run code using wireless connection
-Turn robot off then on
-Ensure battery is fully charged
-Check wiring system for breakages/disconnections
-Redo wiring system (just to be sure)

...

Any suggestions on what else we can try or what the problem may be?