PowerVision 2.8.10546 and PV780.
I upgraded to 2.8.10546 from 2.8.10366. In all my configurations the NMEA2000 Device Class has been set to zero.

I removed 10546 and installed 10366 again and all was back to normal.
In Patch 1 (2.8.10491) you added a "NMEA devices support Manufacturer’s Code address type" feature. Can this have something to do with it?