[Hoary] Missing icons

[Eric Dunbar]

I've been running Hoary since early December, updated regularly using
Synaptic until January and now via "sudo apt-get update && sudo
apt-get -y dist-upgrade".

About two weeks ago (perhaps more?) I lost a significant % of the
icons on my desktop, from the "Applications, Places and System" menus,
from Nautilus, Evolution and from FireFox (missing the "new tab"
icon).

In the apps the icons have been replaced by a generic icon, and the
icons in the menu are simply just missing.

I can regain some icons in Nautilus by changing the themes (e.g. get
trash can back, or folder icon, or both).

Any insights?

Eric.