Who knows why it happens, but you can restore them manually. Click in one of
the entries with missing leader, go to Format | Tabs, select the tab stop
that should have the leader, select the period leader, and click OK. Because
TOC styles are by default set to update automatically, making this change in
one entry should update all entries at that level. Repeat as needed for
other levels.
--
Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
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