Steam won't save my options

[Neumi]

This goes for all games and also for Steam itself.
I can switch the language, that option gets saved. But all other options are being ignored.
First of all I get auto logged in to the friends list when I start steam.
I opened the options panel, disabled the options, clicked "ok", but it didn't do any good. I still got logged on the next time Steam was launched. I repeated my actions, reopened the settings panel and saw that all changes I had made earlier were ignored.

Also I want to disable the ingame community stuff. Also this is not possible.
I tried to set the option for single games, also these games ignored my choices.

What is this about?
What do I need to change in the vdf files so I won't get connected to the friends list and to turn off the ingame community stuff?

[Danomate]

I'm having the same problem, can't set launch options or any other settings, it allows me to enter them but they do not save :(

[Neumi]

I had to do it the hard way: I uninstalled Steam and deleted all property files. After that however Steam would not recognize any installed games so I had to download/reinstall the whole bunch again. But at least then it worked again.