When I bring up the ABOUT screen on my EF4500, it reports "ARINC: NA" in the Version Info section. All ARINC-429 functions seem to be working fine though - GPS, VOR, OBS, A/P, etc. I went to reload the ARINC software and on that screen it reports the ARINC sw version 4.0 correctly before and after the software load. The only screen that doesn't work correctly seems to be the ABOUT screen.

I had just updated the system software to S08.08.02-MV15 (from S08.07.10-MV15) so, thinking that may have caused the problem, I reloaded the older version. No help, so I again loaded the newest version. It had been working correctly in the past, but I don't really know when this problem started because I don't check the ABOUT screen very often.

What could be the cause of the ABOUT screen not reporting the ARINC sw version correctly, but everything else working as it should?

I have a couple of screen shots, but I am unable to post them from my work computer.

I'm stumped...