Permanent Solution for Heading Number Corruption (Black Boxes)?

I’m working with a newly updated template (.dot) and now new documents created with the template are experiencing the Heading Number black box issue (see attached).

The issue only pops up after saving and reopening the new document (doesn’t show up on initial creation). Reapplying the style (using Apply Styles dialog [Ctrl+Shift+S]) fixes the issue, but once the document is reopened the corruption returns.

Setting the style to automatically update (via Developer > Document Template) fixes the issue, but there are occasions where changes are made to the headings in a particular document (e.g., adjusting the spacing before and/or after) that I don’t want to be undone upon reopening the document.

Also, the issue happens with EVERY new document created by double clicking on my updated template, so I imagine there must be some issue in the template that is causing the problem.

Anyone here have a “permanent” fix for this? I’ve gone through several threads on the interwebs, and none of the solutions have worked.

Attachment 662200

Somehow I deleted the image attachment. Reposting here.
Attachment 662212

A solution was found - the following macro run in the corrupted document appears to have permanently fixed the issue.

Sub ResetHeadings()
For Each templ In ActiveDocument.ListTemplates
For Each lev In templ.ListLevels
lev.Font.Reset
Next lev
Next templ
End Sub

Credit to Doug Robbins on the Microsoft Office forum for macro (couldn't post link to page).