Mess after last upgrades

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https://bbs.archlinux.org – Hi!I'm using Arch only about a year, but usually everything was fine. But about 4 days ago after upgrade I couldn't mount any partition without sudo. I'm using KDEs Dolphin and is says "Not Authorised". I couldn't use my 3G modem. Also I couldn't connect to any WiFi (it was giving me some error after choosing network connection (sorry, don't remember what kind of error)) and suspend stopped working - now it only blocks screen to ask for password... I've downgraded some random important packages (linux util-linux networkmanager linux-headers) guessin (HowTos)