Unable to edit header

It does not seem possible to edit the header row. When you add a column, you cannot add or edit the column header (it remains blank).

Otherwise a nice neat tool that saves firing up Excel for simple edits.

Start by reproducing the issue in TableTool on the Mac: add a column and try to enter or edit its header. Trace the column-header editing path from there; the fix is complete when newly added headers can be entered, edited, and retained instead of remaining blank.

Written by the indexing model from the issue text.