Lost vertical connections

Question:

I have lost my schedule's vertical connections, globally (all of them!). Any ideas how that happened?

Answer:

There is a toggle on the View tab which turns on (or off) the display of the vertical links. On the View tab, in the Optional Items section, Task Links. The task links will not be deleted, just hidden from view.

Note: Links can also be individually hidden. If you have a single link missing, do this:

Click once to select a symbol which should have a connection to a symbol on a subsequent row.
Click the small Vertical Links tab on the bottom of the toolbar. Make sure Hide Vertical Links from this symbol is not checked.