Thanks, Michael!
In this case it was because we have Profiles set up on the file cabinet, and when you add a new field, it is not visible in any way under those Profiles. I was viewing the new field via the default Profile, which does display new fields by default, but I have to explicitly make the field viewable in those other more limited Profiles.
The field had already been made visible and moved to an appropriate location on all dialogs, that's why I could see it.
I actually had the same issue when adding a field to this cabinet about a year ago, but I had forgotten what I learned back then. Been a busy year. *smile*
Thanks,
sutekh137