Only root can access devices

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http://forums.fedoraforum.org – I have recently replaced Fedora 16 with 18 and now I have a problem with accessing devices. USB flash drives and partitions not listed in fstab require a root password to mount, which is actually good and it could stay that way. But my real problem is that neither my mouse nor my webcam don't want to work for anyone apart from root. I tried changing permissions in /dev and adding users to groups, but that didn't help. When I attach a device, the TTYs get spammed with: systemd-udevd[]: Failed to set security context (null) for *file*: File exists Where *file*, in case of mouse, is e (HowTos)