We had no issues this year (with java).
I recall a similar issue a few years ago with the cRIO due to a missing jumper, but the roboRIO documentation simply states (top of page 7):
Quote:
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Originally Posted by NI roboRIO User Manual
The input voltage monitoring circuit monitors the voltage on the input voltage pin. [apparently referring to the difference between black and red wires on the COMBICON power connector]
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