I have exactly same problem, VPN tab missing when "Available to all
users" is checked. It happened sometime few months ago after I installed
updates, I think after kernel update.
Beside the missing tab problem I have another problem, my VPN
connection keeps failing to connect. I imported the Cisco config file
again but it does not work. When I try to connect vpn using vpnc with
the same config file converted to vpnc config file in the shell I am
getting "Segmentation error" message.
When I try this on my laptop with Network Manager in SLED11 using the
same config file everything works fine.
Does anybody know how to fix it?
Thank you.

Kernel 2.6.32.46-0.3-default


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SLED11 SP1 x86_64 Kernel 2.6.32.27-0.2-default, GNOME 2.28.2
nVidia Quadro FX 380, NVIDIA Driver Version: 256.53
HP xw4600 workstation, Intel Core2 Duo 3.06GHz
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