Locked TCP/IP settings on W500

I am using ThinkVantage Access Connections to switch my network settings between workplaces. Today all attempts to switch from one ethernet-based setting (manual IP) to another (dhcp-based) setting failed. I then tried to change the settings directly (without ThinkVantage). However when I try to set an IP adress to "automatic", it will prompt me for a restart (eventhough I am admin) after the restart the setting is back to manual IP. I have then deinstalled ThinkVantage Access Connections (keeping only the profiles) - however this doesn't seem to change anything, I still can't change the TCP/IP setting to DHCP (it will prompt me for a restart, after which it's still in the manual setting). After the deinstallation of ThinkVantage, Windows WLAN detection fails as well. I installed now and updated version of ThinkVantage Access Connections. Still no success.
Any help? Why is this TCP/IP setting locked?

Go into Settings > Network, choose your network and on the bottom, instead of auto choose manual.

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Yes, buy I also state in my original post that I:
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Message was edited by: Thomas Camilleri

Odd. You may be able to repair this with the 10.5.7 Combo Update This is a fuller install, as opposed to an incremental "delta" update so it should overwrite any files that are damaged or missing. It does not matter if you have applied it before.
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Message was edited by: macjack

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Message was edited by: DominikB

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Locked TCP/IP settings on W500

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