Mac is not remembering specific network I keep the option to auto-join preferred networks on wake.

However, after I reconfigured my router at home, my home network simply ignores that option.

I have already tried fixing HD permissions on Disc Utility. Didn't work.
What else can I do?

P.S.: The config is still working at work.
I've had the same thing happen to me.  Just create a new location with appropriate preferred settings and have that one connect.  You can delete the old one if necessary.