No suggestions? Just as well.
To follow up and for future readers. This ended up not being an Advanced HMI issue, just appeared to be because some registers were not read properly.
This is with an AB CompactLogix 5380. At the same time, I had a problem with not being able to save the PLC program to my laptop. I don't have the exact message, but something about an offset being bad. I had to do a download to the PLC to fix that, which it did. At the same time, that also fixed my array displaying issue, that is now also working correctly again.
This is not the first time that I have had issues reading registers in AB ControlLogix PLCs that appeared in Advanced HMI. In both times a download of the PLC program to the PLC fixed it. Just something else to consider for others with similar issues.