Just experienced this issue for the first time on an up to date 12.04 (32-bit OS, AMD Phenom(tm) II X4 955 Processor × 4, Realtek RTL8111/8168B PCI Express Gigabit Ethernet Controller), so it looks like the latest update is actually *causing* the issue for me.
Killing/restarting the nm-applet works around the issue, but it returns after a reboot.
Just experienced this issue for the first time on an up to date 12.04 (32-bit OS, AMD Phenom(tm) II X4 955 Processor × 4, Realtek RTL8111/8168B PCI Express Gigabit Ethernet Controller), so it looks like the latest update is actually *causing* the issue for me.
Killing/restarting the nm-applet works around the issue, but it returns after a reboot.