[s1900ahon]

I remember seeing Joe Hershberger (jhersh) diagnosing a problem at the Alamo regional once that mystified all present. On your list of things to check please add the following:

The pins on the DSub connector on the cRIO may get bent if the module is not inserted correctly. It is unusual, but I've seen it happen twice now. Depending on which pin is bent, the module may power up and report fine, but may not function properly.