I'm also seeing this on a Jaunty to Karmic upgrade.
I've ran the icon-cache update tool, that I read from Google searches, no 
change.
Once I click the 'OK' on the prompt (I get three prompts) then my network 
connectivity stops.

If I run `nm-applet` from the command line I see this:
---
** (nm-applet:2246): WARNING **: Icon nm-signal-00 missing: Error opening file: 
No such file or directory
---
>From strace I've learned this:
----
lstat64("/usr/share/icons/elementaryXubuntu/apps/48/nm-signal-00.svg", 
{st_mode=S_IFLNK|0777, st_size=15, ...}) = 0
stat64("/usr/share/icons/elementaryXubuntu/apps/48/nm-signal-00.svg", 
0xbfdcd36c) = -1 ENOENT (No such file or directory)
readlink("/usr/share/icons/elementaryXubuntu/apps/48/nm-signal-00.svg", 
"nm-signal-0.svg", 256) = 15
open("/usr/share/icons/elementaryXubuntu/apps/48/nm-signal-00.svg", 
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
** (nm-applet:2632): WARNING **: Icon nm-signal-00 missing: Error opening file: 
No such file or directory
----
And if I look for those files, I can see their links are broken
----
r...@fluorine:/usr/share/icons/elementaryXubuntu/apps/48# ls -alh nm*
lrwxrwxrwx 1 root root 15 2009-10-16 22:13 nm-signal-00.svg -> nm-signal-0.svg
lrwxrwxrwx 1 root root 54 2009-10-16 22:13 nm-signal-0.svg -> 
../../status/48/notification-network-wireless-none.svg
lrwxrwxrwx 1 root root 54 2009-10-16 22:13 nm-signal-100.svg -> 
../../status/48/notification-network-wireless-full.svg
lrwxrwxrwx 1 root root 53 2009-10-16 22:13 nm-signal-25.svg -> 
../../status/48/notification-network-wireless-low.svg
lrwxrwxrwx 1 root root 56 2009-10-16 22:13 nm-signal-50.svg -> 
../../status/48/notification-network-wireless-medium.svg
lrwxrwxrwx 1 root root 54 2009-10-16 22:13 nm-signal-75.svg -> 
../../status/48/notification-network-wireless-high.svg
----
So then I did this:
r...@fluorine:/usr/share/icons/elementaryXubuntu/apps/48# ln -s 
../../status/48/nm-signal-00.svg ./nm-signal-0.svg
r...@fluorine:/usr/share/icons/elementaryXubuntu/apps/48# ln -s 
../../status/48/nm-signal-00.svg ./nm-signal-00.svg
r...@fluorine:/usr/share/icons/elementaryXubuntu/apps/48# ln -s 
../../status/48/nm-signal-25.svg ./nm-signal-25.svg
r...@fluorine:/usr/share/icons/elementaryXubuntu/apps/48# ln -s 
../../status/48/nm-signal-50.svg ./nm-signal-50.svg
r...@fluorine:/usr/share/icons/elementaryXubuntu/apps/48# ln -s 
../../status/48/nm-signal-75.svg ./nm-signal-75.svg
r...@fluorine:/usr/share/icons/elementaryXubuntu/apps/48# ln -s 
../../status/48/nm-signal-100.svg ./nm-signal-100.svg
----
To get this:
r...@fluorine:/usr/share/icons/elementaryXubuntu/apps/48# ls -alh nm-*
lrwxrwxrwx 1 root root 32 2009-10-21 09:03 nm-signal-00.svg -> 
../../status/48/nm-signal-00.svg
lrwxrwxrwx 1 root root 32 2009-10-21 09:03 nm-signal-0.svg -> 
../../status/48/nm-signal-00.svg
lrwxrwxrwx 1 root root 33 2009-10-21 09:03 nm-signal-100.svg -> 
../../status/48/nm-signal-100.svg
lrwxrwxrwx 1 root root 32 2009-10-21 09:03 nm-signal-25.svg -> 
../../status/48/nm-signal-25.svg
lrwxrwxrwx 1 root root 32 2009-10-21 09:03 nm-signal-50.svg -> 
../../status/48/nm-signal-50.svg
lrwxrwxrwx 1 root root 32 2009-10-21 09:03 nm-signal-75.svg -> 
../../status/48/nm-signal-75.svg
----

Now NetworkManager/nm-applet runs as expected and their is no more error
messages.

-- 
The NetworkManager applet could not find some required resources.  It cannot 
continue.
https://bugs.launchpad.net/bugs/126987
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