Sort alphabetically the listbox in the Custom Columns preference tab.

Weird situation you have there. I'm surprised the query that feeds the listbox doesn't flake out when the underlying table changes. Then again, I've never worked at a place where production-table ...

Yes True Column headings are enabled and either field captions, field names, or the first row of data items are used as column headings or chart labels. No False (Default) Column headings are not ...