network manager hiccup

[Verde Denim]

Twice after an update I've noticed that the network manager has lost its
way.
Looking at the menu items under 'More networks' and 'VPN Connections', I
only see a very small rectangle with no entries (there are normally entries
in both), and Connection Information and Edit Connections doesn't produce
any response at all.

Anyone seen this behavior? What can be done to correct it?

Thanks, as always, for the input.
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