Looks like when the 2CANPlugin gets signaled to close (as the cRIO shuts down), it doesn't shut down correctly and holds everything up.
I fixed the plugin and rev66 is now available to download....
http://www.crosstheroadelectronics.com/2CAN.htm
Bug tracker
http://firstforge.wpi.edu/sf/go/artf...2963447752 59
Let me know if you still have trouble.